status_led: Kconfig migration

Move all of the status LED feature to drivers/led/Kconfig.
The LED status definitions were moved from the board configuration
files to the defconfig files.

TBD: Move all of the definitions in the include/status_led.h to the
relevant board's defconfig files.

Tested boards: CL-SOM-AM57x, CM-T335

Signed-off-by: Uri Mashiach <uri.mashiach@compulab.co.il>
diff --git a/board/ti/beagle/Makefile b/board/ti/beagle/Makefile
index 7a858be..41b552a 100644
--- a/board/ti/beagle/Makefile
+++ b/board/ti/beagle/Makefile
@@ -6,4 +6,4 @@
 #
 
 obj-y	:= beagle.o
-obj-$(CONFIG_STATUS_LED) += led.o
+obj-$(CONFIG_LED_STATUS) += led.o