riscv: canaan: k230_canmv: Add initial support

Add support for K230 CanMV board with serial console and usb otg
support. It can boot via vendor's u-boot-spl and boot into Linux
via tftp through the onboard RTL8152.

Signed-off-by: Junhui Liu <junhui.liu@pigmoral.tech>
Reviewed-by: Leo Yu-Chi Liang <ycliang@andestech.com>
5 files changed