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/UTOO_P66_defconfig b/configs/UTOO_P66_defconfig
index 9ab2fa5..a8618f1 100644
--- a/configs/UTOO_P66_defconfig
+++ b/configs/UTOO_P66_defconfig
@@ -20,3 +20,4 @@
 CONFIG_DEFAULT_DEVICE_TREE="sun5i-a13-utoo-p66"
 CONFIG_SPL=y
 CONFIG_SYS_EXTRA_OPTIONS="AXP209_POWER"
+CONFIG_CMD_SETEXPR=y