Always export DRM_FORMAT_YVU420_ANDROID as DRM_FORMAT_YVU420

Fixes video playback when gralloc0 and software video decoder are used.

Signed-off-by: Roman Stratiienko <r.stratiienko@gmail.com>
Change-Id: I676060021806186bb3c23928d0d54af4add5120a
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/minigbm/+/2589993
Reviewed-by: Gurchetan Singh <gurchetansingh@chromium.org>
Commit-Queue: Gurchetan Singh <gurchetansingh@chromium.org>
Tested-by: Gurchetan Singh <gurchetansingh@chromium.org>
diff --git a/helpers.h b/helpers.h
index 19d0fd7..bbefed8 100644
--- a/helpers.h
+++ b/helpers.h
@@ -7,6 +7,10 @@
 #ifndef HELPERS_H
 #define HELPERS_H
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 #include <stdbool.h>
 
 #include "drv.h"
@@ -42,4 +46,10 @@
 uint64_t drv_pick_modifier(const uint64_t *modifiers, uint32_t count,
 			   const uint64_t *modifier_order, uint32_t order_count);
 bool drv_has_modifier(const uint64_t *list, uint32_t count, uint64_t modifier);
+uint32_t drv_get_standard_fourcc(uint32_t fourcc_internal);
+
+#ifdef __cplusplus
+}
+#endif
+
 #endif