drm/amdgpu/vcn5.0.1: drop dpm power helpers

VCN 5.0.1 doesn't support powergating so there is
no need to call these.

Reviewed-by: Lijo Lazar <lijo.lazar@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/amdgpu/vcn_v5_0_1.c

@@ -575,11 +575,6 @@ static int vcn_v5_0_1_start(struct amdgpu_device *adev)
 	uint32_t tmp;
 	int i, j, k, r, vcn_inst;
 
-	for (i = 0; i < adev->vcn.num_vcn_inst; ++i) {
-		if (adev->pm.dpm_enabled)
-			amdgpu_dpm_enable_vcn(adev, true, i);
-	}
-
 	for (i = 0; i < adev->vcn.num_vcn_inst; ++i) {
 		fw_shared = adev->vcn.inst[i].fw_shared.cpu_addr;
 
@@ -818,11 +813,6 @@ static int vcn_v5_0_1_stop(struct amdgpu_device *adev)
 		WREG32_SOC15(VCN, vcn_inst, regUVD_STATUS, 0);
 	}
 
-	for (i = 0; i < adev->vcn.num_vcn_inst; ++i) {
-		if (adev->pm.dpm_enabled)
-			amdgpu_dpm_enable_vcn(adev, false, i);
-	}
-
 	return 0;
 }