drm/amdgpu: Clean up errors in amdgpu.h

Fix the following errors reported by checkpatch:

ERROR: open brace '{' following struct go on the same line
Signed-off-by: chenxuebing <chenxb_99091@126.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/amdgpu/amdgpu.h

@@ -115,14 +115,12 @@
 
 #define MAX_GPU_INSTANCE		64
 
-struct amdgpu_gpu_instance
-{
+struct amdgpu_gpu_instance {
 	struct amdgpu_device		*adev;
 	int				mgpu_fan_enabled;
 };
 
-struct amdgpu_mgpu_info
-{
+struct amdgpu_mgpu_info {
 	struct amdgpu_gpu_instance	gpu_ins[MAX_GPU_INSTANCE];
 	struct mutex			mutex;
 	uint32_t			num_gpu;
@@ -141,8 +139,7 @@ enum amdgpu_ss {
 	AMDGPU_SS_DRV_UNLOAD
 };
 
-struct amdgpu_watchdog_timer
-{
+struct amdgpu_watchdog_timer {
 	bool timeout_fatal_disable;
 	uint32_t period; /* maxCycles = (1 << period), the number of cycles before a timeout */
 };