Add a minimal generic RK3576 board that only have eMMC, SDMMC and USB
OTG enabled. This defconfig can be used to boot from eMMC or SD-card on
most RK3576 boards that follow reference board design.
eMMC and SD-card boot tested on:
- ArmSoM CM5
- ArmSoM Sige5
- FriendlyElec NanoPi M5
- Luckfox Omni3576
- Toybrick TB-RK3576D
Signed-off-by: Jonas Karlman <jonas@kwiboo.se>
Reviewed-by: Kever Yang <kever.yang@rock-chips.com>
