tree: Run clang-format to conform to the kernel coding style

The coding style has been a bit erratic. Enforce the linux kernel coding
style by reusing their .clang-format file, running clang-format on the
source, and ignoring the few shortcomings that clang-format has at the
moment (especially on aligning the define values).

Signed-off-by: Maxime Ripard <maxime.ripard@bootlin.com>

src/h264.h

@@ -30,7 +30,6 @@
 struct object_surface;
 struct cedrus_data;
 
-int h264_set_controls(struct cedrus_data *data,
-		      struct object_surface *surface);
+int h264_set_controls(struct cedrus_data *data, struct object_surface *surface);
 
 #endif