Convert CONFIG_POWER_PCA9450 to Kconfig

This converts the following to Kconfig:
   CONFIG_POWER_PCA9450

Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/configs/verdin-imx8mp_defconfig b/configs/verdin-imx8mp_defconfig
index bae8179..153c7c1 100644
--- a/configs/verdin-imx8mp_defconfig
+++ b/configs/verdin-imx8mp_defconfig
@@ -143,6 +143,7 @@
 CONFIG_POWER_DOMAIN=y
 CONFIG_IMX8M_POWER_DOMAIN=y
 CONFIG_IMX8MP_HSIOMIX_BLKCTRL=y
+CONFIG_POWER_PCA9450=y
 CONFIG_DM_REGULATOR=y
 CONFIG_DM_REGULATOR_FIXED=y
 CONFIG_DM_REGULATOR_GPIO=y