Start to use amdgpu_bo_create_reserved v2.

v2:
Fix missing pointer init to NULL.
Remove extra new lines.
Signed-off-by: NChristian König <christian.koenig@amd.com>
Signed-off-by: NAndrey Grodzovsky <andrey.grodzovsky@amd.com>
Tested-and-Reviewed-by: NLeo Liu <leo.liu@amd.com>
Signed-off-by: NAlex Deucher <alexander.deucher@amd.com>