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/imx8mp-icore-mx8mp-edimm2.2_defconfig b/configs/imx8mp-icore-mx8mp-edimm2.2_defconfig
index f679fbe..e358847 100644
--- a/configs/imx8mp-icore-mx8mp-edimm2.2_defconfig
+++ b/configs/imx8mp-icore-mx8mp-edimm2.2_defconfig
@@ -99,6 +99,7 @@
 CONFIG_SPL_PINCTRL=y
 CONFIG_PINCTRL_IMX8M=y
 CONFIG_SPL_POWER_LEGACY=y
+CONFIG_POWER_PCA9450=y
 CONFIG_DM_REGULATOR=y
 CONFIG_DM_REGULATOR_FIXED=y
 CONFIG_DM_REGULATOR_GPIO=y