drm/amdgpu: remove set but not used variable 'direct_poll' in vcn_v2_5.c

Fixes gcc '-Wunused-but-set-variable' warning:

drivers/gpu/drm/amd/amdgpu/vcn_v2_5.c:1170:39: warning: variable ‘direct_poll’ set but not used [-Wunused-but-set-variable]

It is introduced by commit 7daaebfe ("drm/amdgpu:
add VCN2.5 sriov start for Arctrus"), but never used,
so remove it.
Reviewed-by: Christian König <christian.koenig@amd.com>
Reported-by: Hulk Robot <hulkci@huawei.com>
Signed-off-by: Zheng Bin <zhengbin13@huawei.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/amdgpu/vcn_v2_5.c

@@ -1167,14 +1167,12 @@ static int vcn_v2_5_sriov_start(struct amdgpu_device *adev)
 	uint32_t table_size = 0;
 	struct mmsch_v1_0_cmd_direct_write direct_wt = { { 0 } };
 	struct mmsch_v1_0_cmd_direct_read_modify_write direct_rd_mod_wt = { { 0 } };
-	struct mmsch_v1_0_cmd_direct_polling direct_poll = { { 0 } };
 	struct mmsch_v1_0_cmd_end end = { { 0 } };
 	uint32_t *init_table = adev->virt.mm_table.cpu_addr;
 	struct mmsch_v1_1_init_header *header = (struct mmsch_v1_1_init_header *)init_table;
 
 	direct_wt.cmd_header.command_type = 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;
 
 	header->version = MMSCH_VERSION;