arm64: zynqmp: Remove undocumented arasan, has-mdma property

Property was used long ago by internal Xilinx Linux driver but it is not
documented in DT binding that's why remove it.

Signed-off-by: Michal Simek <michal.simek@amd.com>
Link: https://lore.kernel.org/r/546788df1a64c41e332463411ad99b1f3b40bc96.1756803198.git.michal.simek@amd.com

arch/arm/dts/zynqmp-mini-nand.dts

@@ -42,7 +42,6 @@
 		clock-names = "clk_sys", "clk_flash";
 		#address-cells = <1>;
 		#size-cells = <0>;
-		arasan,has-mdma;
 		num-cs = <2>;
 		nand@0 {
 			reg = <0>;

arch/arm/dts/zynqmp-zc1751-xm016-dc2.dts

@@ -135,7 +135,6 @@
 	status = "okay";
 	pinctrl-names = "default";
 	pinctrl-0 = <&pinctrl_nand0_default>;
-	arasan,has-mdma;
 
 	nand@0 {
 		reg = <0x0>;

arch/arm/dts/zynqmp-zc1751-xm017-dc3.dts

@@ -129,7 +129,6 @@
 /* MT29F64G08AECDBJ4-6 */
 &nand0 {
 	status = "okay";
-	arasan,has-mdma;
 	num-cs = <2>;
 
 	nand@0 {