drm/scheduler: rename gpu_scheduler.c to sched_main.c

Better match the naming of the other components.
Signed-off-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Huang Rui <ray.huang@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/scheduler/Makefile

@@ -20,6 +20,6 @@
 # OTHER DEALINGS IN THE SOFTWARE.
 #
 #
-gpu-sched-y := gpu_scheduler.o sched_fence.o sched_entity.o
+gpu-sched-y := sched_main.o sched_fence.o sched_entity.o
 
 obj-$(CONFIG_DRM_SCHED) += gpu-sched.o