Move setexpr to Kconfig

Another shell scripting command that has not been moved.

Moved using tools/moveconfig.py using these settings:

CMD_SETEXPR bool n y

Signed-off-by: Joe Hershberger <joe.hershberger@ni.com>
Cc: Masahiro Yamada <yamada.masahiro@socionext.com>
diff --git a/configs/m28evk_defconfig b/configs/m28evk_defconfig
index 9b5e593..091f675 100644
--- a/configs/m28evk_defconfig
+++ b/configs/m28evk_defconfig
@@ -1,4 +1,5 @@
 CONFIG_ARM=y
 CONFIG_TARGET_M28EVK=y
 CONFIG_SPL=y
+CONFIG_CMD_SETEXPR=y
 CONFIG_REGEX=y