power: twl4030: Move CONFIG_TWL4030_POWER to Kconfig

As requested, I added the CONFIG_TWL4030_POWER to Kconfig and made it
the implied default when selecting OMAP34XX as a platform.

Signed-off-by: Adam Ford <aford173@gmail.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
diff --git a/drivers/power/Kconfig b/drivers/power/Kconfig
index 911ecb1..a7d56e6 100644
--- a/drivers/power/Kconfig
+++ b/drivers/power/Kconfig
@@ -308,4 +308,11 @@
 	is typically used to power the VDD-CPU and should be 1200mV.
 	Values can range from 680mV till 1950mV.
 
+config TWL4030_POWER
+	depends on OMAP34XX
+	bool "Enable driver for TI TWL4030 power management chip"
+	---help---
+	The TWL4030 in a combination audio CODEC/power management with
+	GPIO and it is commonly used with the OMAP3 family of processors
+
 endmenu