Cleanup harware properties.

1. Remove unused hw.camera.maxHorizontalPixels, and hw.camera.maxVerticalPixels parameters.
2. Combine hw.touchScreen, and hw.multiTouch under one property: hw.screen

Change-Id: I3cdf64f7d7e46486110cbc0769f9d98a61f0bea5
diff --git a/android/help.c b/android/help.c
index db46d21..db630e0 100644
--- a/android/help.c
+++ b/android/help.c
@@ -1497,7 +1497,7 @@
 
     "     touch       -> emulate a touch screen\n"
     "     multi-touch -> emulate a multi-touch screen\n"
-    "     off         -> disable touch and multi-touch screen emulation\n\n"
+    "     no-touch    -> disable touch and multi-touch screen emulation\n\n"
 
     "  Default mode for screen emulation is 'touch'.\n\n"
     );