ingres: Define screen density

Change-Id: Iaf2eb51d93f41cf632c896d6ec4e06ea7b128dcd
diff --git a/BoardConfig.mk b/BoardConfig.mk
index 1c788e9..d13576b 100644
--- a/BoardConfig.mk
+++ b/BoardConfig.mk
@@ -11,3 +11,6 @@
 include vendor/xiaomi/ingres/BoardConfigVendor.mk
 
 DEVICE_PATH := device/xiaomi/ingres
+
+# Screen density
+TARGET_SCREEN_DENSITY := 395