drm/amdgpu: update psp_fw_type enum in amdgpu_ucode header

To match with the definition in psp firmware

Acked-by: Christian König <[e-mail]>
Signed-off-by: Hawking Zhang <[e-mail]>
Reviewed-by: Le Ma <[e-mail]>
Signed-off-by: Alex Deucher <[e-mail]>

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

···
 	PSP_FW_TYPE_PSP_INTF_DRV,
 	PSP_FW_TYPE_PSP_DBG_DRV,
 	PSP_FW_TYPE_PSP_RAS_DRV,
+	PSP_FW_TYPE_MAX_INDEX,
 };
 
 /* version_major=2, version_minor=0 */