drm/exynos: add extern C guard for the UAPI header

Cc: Andrzej Hajda <[e-mail]>
Cc: Inki Dae <[e-mail]>

Signed-off-by: Emil Velikov <[e-mail]>

include/uapi/drm/exynos_drm.h

···
 
 #include "drm.h"
 
+#if defined(__cplusplus)
+extern "C" {
+#endif
+
 /**
  * User-desired buffer creation information structure.
  *
···
 	__u32			reserved;
 	__u32			buf_id[EXYNOS_DRM_OPS_MAX];
 };
+
+#if defined(__cplusplus)
+}
+#endif
 
 #endif /* _UAPI_EXYNOS_DRM_H_ */