drm/amd/display/amdgpu_dm/amdgpu_dm_pp_smu: Remove unused function 'pp_nv_set_pme_wa_enable()'

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

 drivers/gpu/drm/amd/amdgpu/../display/amdgpu_dm/amdgpu_dm_pp_smu.c:664:20: warning: no previous prototype for ‘pp_nv_set_pme_wa_enable’ [-Wmissing-prototypes]

Cc: Harry Wentland <harry.wentland@amd.com>
Cc: Leo Li <sunpeng.li@amd.com>
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/display/amdgpu_dm/amdgpu_dm_pp_smu.c

@@ -661,22 +661,6 @@ static enum pp_smu_status pp_nv_set_wm_ranges(struct pp_smu *pp,
 	return PP_SMU_RESULT_OK;
 }
 
-static enum pp_smu_status pp_nv_set_pme_wa_enable(struct pp_smu *pp)
-{
-	const struct dc_context *ctx = pp->dm;
-	struct amdgpu_device *adev = ctx->driver_context;
-	struct smu_context *smu = &adev->smu;
-
-	if (!smu->ppt_funcs)
-		return PP_SMU_RESULT_UNSUPPORTED;
-
-	/* 0: successful or smu.ppt_funcs->set_azalia_d3_pme = NULL;  1: fail */
-	if (smu_set_azalia_d3_pme(smu))
-		return PP_SMU_RESULT_FAIL;
-
-	return PP_SMU_RESULT_OK;
-}
-
 static enum pp_smu_status pp_nv_set_display_count(struct pp_smu *pp, int count)
 {
 	const struct dc_context *ctx = pp->dm;