minigbm: add clang-format and presubmit hooks

Running the presubmit.sh script will apply our rules to every file in
the repo. Exclude gbm.h from the formatting requirements since this file
was taken from other open-source projects, and diffing will be easier
without our formatting rules.

In addition, special case drivers where the order of includes matters.

BUG=none
TEST=Verified the following commands succeed:

emerge-cyan minigbm/arc-cros-gralloc
emerge-oak minigbm/arc-cros-gralloc
emerge-veyron_minnie-cheets minigbm/arc-cros-gralloc
emerge-peach_pi minigbm
emerge-nyan_big minigbm
emerge-jadeite minigbm

Change-Id: I6ce93fb1930da254d13d5017766c17341870ccc9
Reviewed-on: https://chromium-review.googlesource.com/447319
Commit-Ready: Gurchetan Singh <gurchetansingh@chromium.org>
Tested-by: Gurchetan Singh <gurchetansingh@chromium.org>
Reviewed-by: Gurchetan Singh <gurchetansingh@chromium.org>
diff --git a/helpers.h b/helpers.h
index 5acd01f..ebe6987 100644
--- a/helpers.h
+++ b/helpers.h
@@ -10,29 +10,23 @@
 #include "drv.h"
 
 uint32_t drv_stride_from_format(uint32_t format, uint32_t width, size_t plane);
-int drv_bo_from_format(struct bo *bo, uint32_t stride,
-		       uint32_t aligned_height, uint32_t format);
-int drv_dumb_bo_create(struct bo *bo, uint32_t width, uint32_t height,
-		       uint32_t format, uint32_t flags);
+int drv_bo_from_format(struct bo *bo, uint32_t stride, uint32_t aligned_height, uint32_t format);
+int drv_dumb_bo_create(struct bo *bo, uint32_t width, uint32_t height, uint32_t format,
+		       uint32_t flags);
 int drv_dumb_bo_destroy(struct bo *bo);
 int drv_gem_bo_destroy(struct bo *bo);
 int drv_prime_bo_import(struct bo *bo, struct drv_import_fd_data *data);
 void *drv_dumb_bo_map(struct bo *bo, struct map_info *data, size_t plane);
-uintptr_t drv_get_reference_count(struct driver *drv, struct bo *bo,
-				  size_t plane);
-void drv_increment_reference_count(struct driver *drv, struct bo *bo,
-				   size_t plane);
-void drv_decrement_reference_count(struct driver *drv, struct bo *bo,
-				   size_t plane);
+uintptr_t drv_get_reference_count(struct driver *drv, struct bo *bo, size_t plane);
+void drv_increment_reference_count(struct driver *drv, struct bo *bo, size_t plane);
+void drv_decrement_reference_count(struct driver *drv, struct bo *bo, size_t plane);
 uint32_t drv_log_base2(uint32_t value);
-int drv_add_combination(struct driver *drv, uint32_t format,
-			struct format_metadata *metadata, uint64_t usage);
-int drv_add_combinations(struct driver *drv, const uint32_t *formats,
-			 uint32_t num_formats, struct format_metadata *metadata,
-			 uint64_t usage);
-void drv_modify_combination(struct driver *drv, uint32_t format,
-			    struct format_metadata *metadata, uint64_t usage);
+int drv_add_combination(struct driver *drv, uint32_t format, struct format_metadata *metadata,
+			uint64_t usage);
+int drv_add_combinations(struct driver *drv, const uint32_t *formats, uint32_t num_formats,
+			 struct format_metadata *metadata, uint64_t usage);
+void drv_modify_combination(struct driver *drv, uint32_t format, struct format_metadata *metadata,
+			    uint64_t usage);
 struct kms_item *drv_query_kms(struct driver *drv, uint32_t *num_items);
-int drv_add_linear_combinations(struct driver *drv, const uint32_t *formats,
-				uint32_t num_formats);
+int drv_add_linear_combinations(struct driver *drv, const uint32_t *formats, uint32_t num_formats);
 #endif