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/vc4.c b/vc4.c
index 7036de7..9103b8a 100644
--- a/vc4.c
+++ b/vc4.c
@@ -16,18 +16,16 @@
 #include "helpers.h"
 #include "util.h"
 
-static const uint32_t supported_formats[] = {
-	DRM_FORMAT_ARGB8888, DRM_FORMAT_RGB565, DRM_FORMAT_XRGB8888
-};
+static const uint32_t supported_formats[] = { DRM_FORMAT_ARGB8888, DRM_FORMAT_RGB565,
+					      DRM_FORMAT_XRGB8888 };
 
 static int vc4_init(struct driver *drv)
 {
-	return drv_add_linear_combinations(drv, supported_formats,
-					   ARRAY_SIZE(supported_formats));
+	return drv_add_linear_combinations(drv, supported_formats, ARRAY_SIZE(supported_formats));
 }
 
-static int vc4_bo_create(struct bo *bo, uint32_t width, uint32_t height,
-			 uint32_t format, uint32_t flags)
+static int vc4_bo_create(struct bo *bo, uint32_t width, uint32_t height, uint32_t format,
+			 uint32_t flags)
 {
 	int ret;
 	size_t plane;
@@ -48,7 +46,8 @@
 	ret = drmIoctl(bo->drv->fd, DRM_IOCTL_VC4_CREATE_BO, &bo_create);
 	if (ret) {
 		fprintf(stderr, "drv: DRM_IOCTL_VC4_GEM_CREATE failed "
-				"(size=%zu)\n", bo->total_size);
+				"(size=%zu)\n",
+			bo->total_size);
 		return ret;
 	}
 
@@ -66,8 +65,7 @@
 	memset(&bo_map, 0, sizeof(bo_map));
 	bo_map.handle = bo->handles[0].u32;
 
-	ret = drmCommandWriteRead(bo->drv->fd, DRM_VC4_MMAP_BO, &bo_map,
-				  sizeof(bo_map));
+	ret = drmCommandWriteRead(bo->drv->fd, DRM_VC4_MMAP_BO, &bo_map, sizeof(bo_map));
 	if (ret) {
 		fprintf(stderr, "drv: DRM_VC4_MMAP_BO failed\n");
 		return MAP_FAILED;
@@ -75,12 +73,11 @@
 
 	data->length = bo->total_size;
 
-	return mmap(0, bo->total_size, PROT_READ | PROT_WRITE, MAP_SHARED,
-		    bo->drv->fd, bo_map.offset);
+	return mmap(0, bo->total_size, PROT_READ | PROT_WRITE, MAP_SHARED, bo->drv->fd,
+		    bo_map.offset);
 }
 
-struct backend backend_vc4 =
-{
+struct backend backend_vc4 = {
 	.name = "vc4",
 	.init = vc4_init,
 	.bo_create = vc4_bo_create,