Adding 400dpi support to emulator.

Change-Id: I7d04988e539f29028b86ba6c4daae5bae3be9543
diff --git a/android/hw-lcd.h b/android/hw-lcd.h
index 22e53c9..b8abb58 100644
--- a/android/hw-lcd.h
+++ b/android/hw-lcd.h
@@ -17,6 +17,7 @@
 #define  LCD_DENSITY_TVDPI     213
 #define  LCD_DENSITY_HDPI      240
 #define  LCD_DENSITY_XHDPI     320
+#define  LCD_DENSITY_400DPI    400
 #define  LCD_DENSITY_XXHDPI    480
 #define  LCD_DENSITY_XXXHDPI   640