gralloc: Add missing format HAL_PIXEL_FORMAT_YCrCb_420_SP_VENUS

Add missing HAL_PIXEL_FORMAT_YCrCb_420_SP_VENUS in YUV format checks.
Move IsYUVFormat utility to grallocutils.

Change-Id: I8103ba2aead0d00aede21a0b43a59af741b2df95
CRs-fixed: 2166182
diff --git a/libgralloc1/gr_utils.h b/libgralloc1/gr_utils.h
index 4b2f136..7fcb6c2 100644
--- a/libgralloc1/gr_utils.h
+++ b/libgralloc1/gr_utils.h
@@ -60,6 +60,7 @@
   return (Type1)((x + (Type1)align - 1) & ~((Type1)align - 1));
 }
 
+bool IsYuvFormat(const private_handle_t *hnd);
 bool IsCompressedRGBFormat(int format);
 bool IsUncompressedRGBFormat(int format);
 uint32_t GetBppForUncompressedRGB(int format);