drm/amdkfd: remove duplicate include of kfd_svm.h

kfd_svm.h is included duplicately in commit 42de677f


("drm/amdkfd: register svm range").

After checking possible related header files,
remove the former one to make the code format more reasonable.

Signed-off-by: Wan Jiabing <wanjiabing@vivo.com>
Reviewed-by: Felix Kuehling <Felix.Kuehling@amd.com>
Signed-off-by: Felix Kuehling <Felix.Kuehling@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>