drm/amd/amdgpu/vcn_v3_0: Remove unused variable 'direct_poll' from 'vcn_v3_0_start_sriov()'

Fixes the following W=1 kernel build warning(s):

 drivers/gpu/drm/amd/amdgpu/vcn_v3_0.c: In function ‘vcn_v3_0_start_sriov’:
 drivers/gpu/drm/amd/amdgpu/vcn_v3_0.c:1242:3: warning: variable ‘direct_poll’ set but not used [-Wunused-but-set-variable]

Cc: Alex Deucher <alexander.deucher@amd.com>
Cc: "Christian König" <christian.koenig@amd.com>
Cc: David Airlie <airlied@linux.ie>
Cc: Daniel Vetter <daniel@ffwll.ch>
Cc: amd-gfx@lists.freedesktop.org
Cc: dri-devel@lists.freedesktop.org
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/amdgpu/vcn_v3_0.c

@@ -1266,8 +1266,6 @@ static int vcn_v3_0_start_sriov(struct amdgpu_device *adev)
 		direct_wt = { {0} };
 	struct mmsch_v3_0_cmd_direct_read_modify_write
 		direct_rd_mod_wt = { {0} };
-	struct mmsch_v3_0_cmd_direct_polling
-		direct_poll = { {0} };
 	struct mmsch_v3_0_cmd_end end = { {0} };
 	struct mmsch_v3_0_init_header header;
 
@@ -1275,8 +1273,6 @@ static int vcn_v3_0_start_sriov(struct amdgpu_device *adev)
 		MMSCH_COMMAND__DIRECT_REG_WRITE;
 	direct_rd_mod_wt.cmd_header.command_type =
 		MMSCH_COMMAND__DIRECT_REG_READ_MODIFY_WRITE;
-	direct_poll.cmd_header.command_type =
-		MMSCH_COMMAND__DIRECT_REG_POLLING;
 	end.cmd_header.command_type =
 		MMSCH_COMMAND__END;