configs: odroid-xu3: enable the configs relevant to regulator

Enable the CONFIG_CMD_REGULATOR and CONFIG_DM_REGULATOR_S2MPS11.

Signed-off-by: Jaehoon Chung <jh80.chung@samsung.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
Tested-by: Anand Moon <linux.amoon@gmail.com>