drm/amdgpu: Move csa related code to separate file

In baremetal, also need to reserve csa for preemption.
so move the csa related code out of sriov.

Reviewed-by: Monk Liu <Monk.Liu@amd.com>
Signed-off-by: Rex Zhu <Rex.Zhu@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

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

@@ -75,6 +75,7 @@
 #include "amdgpu_sdma.h"
 #include "amdgpu_dm.h"
 #include "amdgpu_virt.h"
+#include "amdgpu_csa.h"
 #include "amdgpu_gart.h"
 #include "amdgpu_debugfs.h"
 #include "amdgpu_job.h"