power: wandboard: Add a missing CONFIG

We should enable pmic in SPL since it is used.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/configs/wandboard_defconfig b/configs/wandboard_defconfig
index e418e4d..41dace8 100644
--- a/configs/wandboard_defconfig
+++ b/configs/wandboard_defconfig
@@ -70,6 +70,7 @@
 CONFIG_PINCTRL=y
 CONFIG_PINCTRL_IMX6=y
 CONFIG_DM_PMIC=y
+CONFIG_SPL_DM_PMIC=y
 CONFIG_DM_PMIC_PFUZE100=y
 CONFIG_DM_SCSI=y
 CONFIG_DM_SERIAL=y