drm/amdgpu: save the setting of VM_CONTEXT_CNTL

MES firmware needs the setting of VM_CONTEXT_CNTL to perform
vmid switch. Save the initial setting when hub initializing.

Signed-off-by: Jack Xiao <[e-mail]>
Reviewed-by: Hawking Zhang <[e-mail]>
Signed-off-by: Alex Deucher <[e-mail]>

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

···
 	uint32_t	eng_distance;
 	uint32_t	eng_addr_distance; /* include LO32/HI32 */
 
+	uint32_t        vm_cntx_cntl;
 	uint32_t	vm_cntx_cntl_vm_fault;
 	uint32_t	vm_l2_bank_select_reserved_cid2;
 

drivers/gpu/drm/amd/amdgpu/gfxhub_v2_0.c

···
 				    i * hub->ctx_addr_distance,
 				    upper_32_bits(adev->vm_manager.max_pfn - 1));
 	}
+
+	hub->vm_cntx_cntl = tmp;
 }
 
 static void gfxhub_v2_0_program_invalidation(struct amdgpu_device *adev)

drivers/gpu/drm/amd/amdgpu/gfxhub_v2_1.c

···
 				    i * hub->ctx_addr_distance,
 				    upper_32_bits(adev->vm_manager.max_pfn - 1));
 	}
+
+	hub->vm_cntx_cntl = tmp;
 }
 
 static void gfxhub_v2_1_program_invalidation(struct amdgpu_device *adev)

drivers/gpu/drm/amd/amdgpu/gfxhub_v3_0.c

···
 				    i * hub->ctx_addr_distance,
 				    upper_32_bits(adev->vm_manager.max_pfn - 1));
 	}
+
+	hub->vm_cntx_cntl = tmp;
 }
 
 static void gfxhub_v3_0_program_invalidation(struct amdgpu_device *adev)

drivers/gpu/drm/amd/amdgpu/mmhub_v2_0.c

···
 				    i * hub->ctx_addr_distance,
 				    upper_32_bits(adev->vm_manager.max_pfn - 1));
 	}
+
+	hub->vm_cntx_cntl = tmp;
 }
 
 static void mmhub_v2_0_program_invalidation(struct amdgpu_device *adev)

drivers/gpu/drm/amd/amdgpu/mmhub_v2_3.c

···
 				    i * hub->ctx_addr_distance,
 				    upper_32_bits(adev->vm_manager.max_pfn - 1));
 	}
+
+	hub->vm_cntx_cntl = tmp;
 }
 
 static void mmhub_v2_3_program_invalidation(struct amdgpu_device *adev)

drivers/gpu/drm/amd/amdgpu/mmhub_v3_0.c

···
 				    i * hub->ctx_addr_distance,
 				    upper_32_bits(adev->vm_manager.max_pfn - 1));
 	}
+
+	hub->vm_cntx_cntl = tmp;
 }
 
 static void mmhub_v3_0_program_invalidation(struct amdgpu_device *adev)