Add mic mute keyboard led. (2/2)

Change-Id: I6e18c9d99d562aec112fc8ecb3d4e916285368c6
Test: Built
diff --git a/include/input/InputDevice.h b/include/input/InputDevice.h
index 57b659d..663c0c4 100644
--- a/include/input/InputDevice.h
+++ b/include/input/InputDevice.h
@@ -128,8 +128,9 @@
     INPUT = 0,
     PLAYER_ID = 1,
     KEYBOARD_BACKLIGHT = 2,
+    KEYBOARD_MIC_MUTE = 3,
 
-    ftl_last = KEYBOARD_BACKLIGHT
+    ftl_last = KEYBOARD_MIC_MUTE
 };
 
 enum class InputDeviceLightCapability : uint32_t {