configs: enable CONFIG_RESTORE_EXCEPTION_VECTOR_BASE for all mtmips boards

This patch enables CONFIG_RESTORE_EXCEPTION_VECTOR_BASE for all mtmips
boards.

Reviewed-by: Stefan Roese <sr@denx.de>
Reviewed-by: Daniel Schwierzeck <daniel.schwierzeck@gmail.com>
Signed-off-by: Weijie Gao <weijie.gao@mediatek.com>
diff --git a/configs/gardena-smart-gateway-mt7688_defconfig b/configs/gardena-smart-gateway-mt7688_defconfig
index 23d8ddb..9e90284 100644
--- a/configs/gardena-smart-gateway-mt7688_defconfig
+++ b/configs/gardena-smart-gateway-mt7688_defconfig
@@ -11,6 +11,7 @@
 CONFIG_BOOT_ROM=y
 CONFIG_ONBOARD_DDR2_SIZE_1024MBIT=y
 CONFIG_ONBOARD_DDR2_CHIP_WIDTH_16BIT=y
+CONFIG_RESTORE_EXCEPTION_VECTOR_BASE=y
 # CONFIG_MIPS_BOOT_ENV_LEGACY is not set
 CONFIG_MIPS_BOOT_FDT=y
 CONFIG_ENV_VARS_UBOOT_CONFIG=y