drm/amdgpu: Use correct path to trace include

The header comment in include/trace/define_trace.h specifies that the
TRACE_INCLUDE_PATH needs to be relative to the define_trace.h header
rather than the trace file including it. Most instances get that wrong
and work around it by adding the $(src) directory to the include path.

While this works, it is preferable to refer to the correct path to the
trace file in the first place and avoid any workaround.

Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/amdgpu/Makefile

@@ -133,5 +133,3 @@ include $(FULL_AMD_PATH)/powerplay/Makefile
 amdgpu-y += $(AMD_POWERPLAY_FILES)
 
 obj-$(CONFIG_DRM_AMDGPU)+= amdgpu.o
-
-CFLAGS_amdgpu_trace_points.o := -I$(src)