riscv: configs: AE350 will use CONFIG_OF_PRIOR_STAGE when boots from ram

When AE350 boots from ram, use CONFIG_OF_PRIOR_STAGE instead
of CONFIG_OF_BOARD.
Signed-off-by: NRick Chen <rick@andestech.com>
Cc: Greentime Hu <greentime@andestech.com>
Reviewed-by: NBin Meng <bmeng.cn@gmail.com>
Reviewed-by: NLukas Auer <lukas.auer@aisec.fraunhofer.de>

configs/ae350_rv32_defconfig

@@ -14,7 +14,7 @@ CONFIG_CMD_SF_TEST=y
 # CONFIG_CMD_SETEXPR is not set
 CONFIG_BOOTP_PREFER_SERVERIP=y
 CONFIG_CMD_CACHE=y
-CONFIG_OF_BOARD=y
+CONFIG_OF_PRIOR_STAGE=y
 CONFIG_DEFAULT_DEVICE_TREE="ae350_32"
 CONFIG_ENV_IS_IN_SPI_FLASH=y
 CONFIG_NET_RANDOM_ETHADDR=y

configs/ae350_rv64_defconfig

@@ -15,7 +15,7 @@ CONFIG_CMD_SF_TEST=y
 # CONFIG_CMD_SETEXPR is not set
 CONFIG_BOOTP_PREFER_SERVERIP=y
 CONFIG_CMD_CACHE=y
-CONFIG_OF_BOARD=y
+CONFIG_OF_PRIOR_STAGE=y
 CONFIG_DEFAULT_DEVICE_TREE="ae350_64"
 CONFIG_ENV_IS_IN_SPI_FLASH=y
 CONFIG_NET_RANDOM_ETHADDR=y