doc: Remove duplicated documentation directory

Commit ad7061ed74 ("doc: Move device tree bindings documentation to
 doc/device-tree-bindings") moved all device tree binding documentation
to doc/device-tree-bindings directory.

The current U-Boot project still have two documentation directories:

- doc/
- Documentation/

Move all documentation and sphinx files to doc directory so all content
can be in a common place.

Signed-off-by: Breno Lima <breno.lima@nxp.com>

doc/device-tree-bindings/misc/misc/fsl,mpc83xx-serdes.txt

@@ -0,0 +1,24 @@
+MPC83xx SerDes controller devices
+
+MPC83xx SoCs contain a built-in SerDes controller that determines which
+protocols (SATA, PCI Express, SGMII, ...) are used on the system's serdes lines
+and how the lines are configured.
+
+Required properties:
+- compatible: must be "fsl,mpc83xx-serdes"
+- reg: must point to the serdes controller's register map
+- proto: selects for which protocol the serdes lines are configured. One of
+  "sata", "pex", "pex-x2", "sgmii"
+- serdes-clk: determines the frequency the serdes lines are configured for. One
+  of 100, 125, 150.
+- vdd: determines whether 1.0V core VDD is used or not
+
+Example:
+
+SERDES: serdes@e3000 {
+	reg = <0xe3000 0x200>;
+	compatible = "fsl,mpc83xx-serdes";
+	proto = "pex";
+	serdes-clk = <100>;
+	vdd;
+};

doc/device-tree-bindings/misc/misc/gdsys,io-endpoint.txt

@@ -0,0 +1,20 @@
+gdsys IO endpoint of IHS FPGA devices
+
+The IO endpoint of IHS FPGA devices is a packet-based transmission interface
+that allows interconnected gdsys devices to send and receive data over the
+FPGA's main ethernet connection.
+
+Required properties:
+- compatible: must be "gdsys,io-endpoint"
+- reg: describes the address and length of the endpoint's register map (within
+  the FPGA's register space)
+
+Example:
+
+fpga0_ep0 {
+	compatible = "gdsys,io-endpoint";
+	reg = <0x020 0x10
+           0x320 0x10
+           0x340 0x10
+           0x360 0x10>;
+};

doc/device-tree-bindings/misc/misc/gdsys,iocon_fpga.txt

@@ -0,0 +1,19 @@
+gdsys IHS FPGA for CON devices
+
+The gdsys IHS FPGA is the main FPGA on gdsys CON devices. This driver provides
+support for enabling and starting the FPGA, as well as verifying working bus
+communication.
+
+Required properties:
+- compatible: must be "gdsys,iocon_fpga"
+- reset-gpios: List of GPIOs controlling the FPGA's reset
+- done-gpios: List of GPIOs notifying whether the FPGA's reconfiguration is
+              done
+
+Example:
+
+FPGA0 {
+	compatible = "gdsys,iocon_fpga";
+	reset-gpios = <&PPCPCA 26 0>;
+	done-gpios = <&GPIO_VB0 19 0>;
+};

doc/device-tree-bindings/misc/misc/gdsys,iocpu_fpga.txt

@@ -0,0 +1,19 @@
+gdsys IHS FPGA for CPU devices
+
+The gdsys IHS FPGA is the main FPGA on gdsys CPU devices. This driver provides
+support for enabling and starting the FPGA, as well as verifying working bus
+communication.
+
+Required properties:
+- compatible: must be "gdsys,iocpu_fpga"
+- reset-gpios: List of GPIOs controlling the FPGA's reset
+- done-gpios: List of GPIOs notifying whether the FPGA's reconfiguration is
+              done
+
+Example:
+
+FPGA0 {
+	compatible = "gdsys,iocpu_fpga";
+	reset-gpios = <&PPCPCA 26 0>;
+	done-gpios = <&GPIO_VB0 19 0>;
+};

doc/device-tree-bindings/misc/misc/gdsys,soc.txt

@@ -0,0 +1,16 @@
+gdsys soc bus driver
+
+This driver provides a simple interface for the busses associated with gdsys
+IHS FPGAs. The bus itself contains devices whose register maps are contained
+within the FPGA's register space.
+
+Required properties:
+- fpga: A phandle to the controlling IHS FPGA
+
+Example:
+
+FPGA0BUS: fpga0bus {
+	compatible = "gdsys,soc";
+	ranges = <0x0 0xe0600000 0x00004000>;
+	fpga = <&FPGA0>;
+};