exynos: config: enable setexpr command for smdk5250 based boards

This adds the setexpr command which allows basic evaluations in hex, which
is useful for some U-boot command scripts involving addresses.

BUG=chromium:242757
TEST=Manual, boot up U-Boot image, verify setexpr command is in help and
functions.
BRANCH=none

Change-Id: I33158e7588d2c1e98a5bfc2cd8d074e0a751eae8
Signed-off-by: Bernie Thompson <bhthompson@chromium.org>
Reviewed-on: https://gerrit.chromium.org/gerrit/56609
Reviewed-by: Simon Glass <sjg@chromium.org>
diff --git a/include/configs/smdk5250.h b/include/configs/smdk5250.h
index 88d949a..44be192 100644
--- a/include/configs/smdk5250.h
+++ b/include/configs/smdk5250.h
@@ -104,6 +104,7 @@
 #define CONFIG_CMD_TIME
 #define CONFIG_CMD_GPIO
 #define CONFIG_CMD_SOUND
+#define CONFIG_CMD_SETEXPR
 
 #ifdef BUILD_NETWORK_STUFF
 #define CONFIG_CMD_NET