feat: u-boot: rknext: add rock-3a support

Signed-off-by: Nascs Fang <[email protected]>

Author: nascs

u-boot/rknext/fork.conf

@@ -5,6 +5,7 @@ BSP_REPLACES=("rk3588")
 SUPPORTED_BOARDS=(
     #"rock-pi-e"
     "rock-2"
+    "rock-3-a"
     "rock-5-itx" "rock-5a" "rock-5b" "rock-5b-plus" "rock-5c" "rock-5d"
     "rock-5a-spi" "rock-5c-spi" "rock-5d-spi"
     "radxa-e52c"
@@ -36,6 +37,10 @@ bsp_rk3568() {
     RKBIN_DDR="${BSP_SOC}_ddr_1560MHz_v"
 }
 
+bsp_rock-3a() {
+    bsp_rk3568
+}
+
 bsp_rk3588() {
     BSP_SOC="rk3588"
     RKBIN_DDR="${BSP_SOC}_ddr_lp4_2112MHz_lp5_2400MHz"