RM6785: Add 0x2000U to additional gralloc usage bits

W gralloc4: Buffer descriptor with invalid usage bits 0x2000

Change-Id: I8e67bec9ade6e80e2e362f7a3c287f74b7d81242
diff --git a/BoardConfig.mk b/BoardConfig.mk
index 1cbf2bd..8e40e13 100644
--- a/BoardConfig.mk
+++ b/BoardConfig.mk
@@ -48,6 +48,7 @@
 
 # Display
 TARGET_SCREEN_DENSITY := 420
+TARGET_ADDITIONAL_GRALLOC_10_USAGE_BITS := 0x2000U
 
 # Kernel
 BOARD_KERNEL_CMDLINE := bootopt=64S3,32N2,64N2