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/avd/hw-config.c b/android/avd/hw-config.c
index 65796d9..2d50ef7 100644
--- a/android/avd/hw-config.c
+++ b/android/avd/hw-config.c
@@ -125,3 +125,21 @@
 
 #include "android/avd/hw-config-defs.h"
 }
+
+int
+androidHwConfig_isScreenNoTouch( AndroidHwConfig* config )
+{
+    return strcmp(config->hw_screen, "no-touch") == 0;
+}
+
+int
+androidHwConfig_isScreenTouch( AndroidHwConfig* config )
+{
+    return strcmp(config->hw_screen, "touch") == 0;
+}
+
+int
+androidHwConfig_isScreenMultiTouch( AndroidHwConfig* config )
+{
+    return strcmp(config->hw_screen, "multi-touch") == 0;
+}