FP4: Define TARGET_GRALLOC_HANDLE_HAS_RESERVED_SIZE

Otherwise the error happens:

 E qdmetadata: Invalid gralloc handle (at 0x7fc743ec58): ver(12/12) ints(23/22) fds(2/2)
 E qdmetadata: validateAndMap: Private handle is invalid - handle:0x7fc743ec58

Change-Id: Ia62146e8e4bef1342dc964724bd0d088656ad4bc
diff --git a/BoardConfig.mk b/BoardConfig.mk
index 7d1fe5f..0e3db18 100644
--- a/BoardConfig.mk
+++ b/BoardConfig.mk
@@ -52,6 +52,7 @@
 TARGET_BOOTLOADER_BOARD_NAME := FP4
 
 # Display
+TARGET_GRALLOC_HANDLE_HAS_RESERVED_SIZE := true
 TARGET_SCREEN_DENSITY := 440
 TARGET_USES_DISPLAY_RENDER_INTENTS := true
 TARGET_USES_GRALLOC4 := true