drm/amdgpu: Add a new flag for SR-IOV to share memory between PF & VF

Add ATOM_VRAM_BLOCK_SRIOV_MSG_SHARE_RESERVATION to identify whether
driver need to reserve VRAM for SR-IOV shared memory.
Signed-off-by: Horace Chen <horace.chen@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/include/atombios.h

@@ -4292,6 +4292,7 @@ typedef struct _ATOM_DPCD_INFO
 #define ATOM_VRAM_OPERATION_FLAGS_SHIFT        30
 #define   ATOM_VRAM_BLOCK_NEEDS_NO_RESERVATION   0x1
 #define   ATOM_VRAM_BLOCK_NEEDS_RESERVATION      0x0
+#define   ATOM_VRAM_BLOCK_SRIOV_MSG_SHARE_RESERVATION 0x2
 
 /***********************************************************************************/
 // Structure used in VRAM_UsageByFirmwareTable