drm/amdgpu/vcn4.0.3: drop dpm power helpers

VCN 4.0.3 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_v4_0_3.c

@@ -1127,11 +1127,6 @@ static int vcn_v4_0_3_start(struct amdgpu_device *adev)
 	int i, j, k, r, vcn_inst;
 	uint32_t tmp;
 
-	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) {
 		if (adev->pg_flags & AMD_PG_SUPPORT_VCN_DPG) {
 			r = vcn_v4_0_3_start_dpg_mode(adev, i, adev->vcn.indirect_sram);
@@ -1403,11 +1398,6 @@ static int vcn_v4_0_3_stop(struct amdgpu_device *adev)
 		vcn_v4_0_3_enable_clock_gating(adev, i);
 	}
 Done:
-	for (i = 0; i < adev->vcn.num_vcn_inst; ++i) {
-		if (adev->pm.dpm_enabled)
-			amdgpu_dpm_enable_vcn(adev, false, i);
-	}
-
 	return 0;
 }