Convert CONFIG_TWL4030_LED et al to Kconfig

This converts the following to Kconfig:
   CONFIG_TWL4030_LED
   CONFIG_TWL4030_INPUT

This also removes dead references to:
   CONFIG_TWL4030_KEYPAD

Signed-off-by: Adam Ford <aford173@gmail.com>
diff --git a/drivers/misc/Kconfig b/drivers/misc/Kconfig
index 6bcd49a..c2b7cc1 100644
--- a/drivers/misc/Kconfig
+++ b/drivers/misc/Kconfig
@@ -195,6 +195,11 @@
 	  can make requests to the BPMP. This driver is similar to an MFD
 	  driver in the Linux kernel.
 
+config TWL4030_LED
+	bool "Enable TWL4030 LED controller"
+	help
+	  Enable this to add support for the TWL4030 LED controller.
+
 config WINBOND_W83627
 	bool "Enable Winbond Super I/O driver"
 	help