Use -qemu -lcd-density parameter for setting qemu.sf.lcd_density boot property.

Change-Id: Ibfd85c3e351caef89ae57630c824255f29f47914
diff --git a/vl-android.c b/vl-android.c
index 7b661b6..c566d92 100644
--- a/vl-android.c
+++ b/vl-android.c
@@ -3782,6 +3782,15 @@
         }
     }
 
+    /* Set LCD density (if required by -qemu, and AVD is missing it. */
+    if (android_op_lcd_density && !android_hw->hw_lcd_density) {
+        int density;
+        if (parse_int(android_op_lcd_density, &density) || density <= 0) {
+            PANIC("-lcd-density : %d", density);
+        }
+        hwLcd_setBootProperty(density);
+    }
+
     /* Initialize camera emulation. */
     android_camera_service_init();