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/vl-android.c b/vl-android.c
index b7d4bb9..ebff1eb 100644
--- a/vl-android.c
+++ b/vl-android.c
@@ -4260,7 +4260,7 @@
                       cpu_model);
 
         /* Initialize multi-touch emulation. */
-        if (android_hw->hw_multiTouch) {
+        if (androidHwConfig_isScreenMultiTouch(android_hw)) {
             mts_port_create(NULL);
         }