configs: aspeed: Enable CONFIG_SPI_DIRMAP

Enable CONFIG_SPI_DIRMAP on ASPEED platforms.

Signed-off-by: Chin-Ting Kuo <chin-ting_kuo@aspeedtech.com>
diff --git a/configs/evb-ast2500_defconfig b/configs/evb-ast2500_defconfig
index dfcf74a..3061cbe 100644
--- a/configs/evb-ast2500_defconfig
+++ b/configs/evb-ast2500_defconfig
@@ -59,6 +59,7 @@
 CONFIG_SYS_NS16550=y
 CONFIG_SPI=y
 CONFIG_DM_SPI=y
+CONFIG_SPI_DIRMAP=y
 CONFIG_SPI_ASPEED_SMC=y
 CONFIG_SYSRESET=y
 CONFIG_TIMER=y