x86: customize the malloced address to be 16-byte aligned

That can gain better memory performance than 8-byte alignment

Change-Id: Ibcc5bf7b96ed10166038357dd0c86c9171768f3e
Signed-off-by: Jack Ren <jack.ren@intel.com>
Signed-off-by: Bruce Beare <bruce.j.beare@intel.com>
diff --git a/target/board/generic_x86/BoardConfig.mk b/target/board/generic_x86/BoardConfig.mk
index c62b0a4..35a5520 100644
--- a/target/board/generic_x86/BoardConfig.mk
+++ b/target/board/generic_x86/BoardConfig.mk
@@ -18,6 +18,9 @@
 # no hardware camera
 USE_CAMERA_STUB := true
 
+# customize the malloced address to be 16-byte aligned
+BOARD_MALLOC_ALIGNMENT := 16
+
 # Set /system/bin/sh to ash, not mksh, to make sure we can switch back.
 TARGET_SHELL := ash