lights: Adding keypad alt/shift LED light IDs

in conjunction with the keyboard light patch for
frameworks/base:
http://review.cyanogenmod.org/77945

Change-Id: Ie97a80d398d474950340cba60c48ba5904978ec5
diff --git a/include/hardware/lights.h b/include/hardware/lights.h
index b3d28b0..e19f0c6 100644
--- a/include/hardware/lights.h
+++ b/include/hardware/lights.h
@@ -73,6 +73,12 @@
 #define LIGHT_ID_BLUETOOTH          "bluetooth"
 #define LIGHT_ID_WIFI               "wifi"
 
+/*
+ * Additional hardware-specific lights
+ */
+#define LIGHT_ID_CAPS               "caps"
+#define LIGHT_ID_FUNC               "func"
+
 /* ************************************************************************
  * Flash modes for the flashMode field of light_state_t.
  */