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/drivers/power/pmic/Kconfig b/drivers/power/pmic/Kconfig
index d94048d..176fb07 100644
--- a/drivers/power/pmic/Kconfig
+++ b/drivers/power/pmic/Kconfig
@@ -416,6 +416,9 @@
 config POWER_LTC3676
 	bool "Enable legacy driver for LTC3676 PMIC"
 
+config POWER_PCA9450
+	bool "Enable legacy driver for PCA9450 PMIC"
+
 config POWER_PFUZE100
 	bool "Enable legacy driver for PFUZE100 PMIC"