drm/amdgpu/display: clean up dcn2*_pp_smu functions

Use the dcn21 functions in dcn21_resource.c and make the
dcn20 functions static since they are only used in
dcn20_resource now.

Cc: [e-mail]
Reviewed-by: Harry Wentland <[e-mail]>
Signed-off-by: Alex Deucher <[e-mail]>

drivers/gpu/drm/amd/display/dc/dcn20/dcn20_resource.c

···
 	.create_hwseq = dcn20_hwseq_create,
 };
 
+static void dcn20_pp_smu_destroy(struct pp_smu_funcs **pp_smu);
+
 void dcn20_clock_source_destroy(struct clock_source **clk_src)
 {
 	kfree(TO_DCE110_CLK_SRC(*clk_src));
···
 	return true;
 }
 
-struct pp_smu_funcs *dcn20_pp_smu_create(struct dc_context *ctx)
+static struct pp_smu_funcs *dcn20_pp_smu_create(struct dc_context *ctx)
 {
 	struct pp_smu_funcs *pp_smu = kzalloc(sizeof(*pp_smu), GFP_KERNEL);
 
···
 	return pp_smu;
 }
 
-void dcn20_pp_smu_destroy(struct pp_smu_funcs **pp_smu)
+static void dcn20_pp_smu_destroy(struct pp_smu_funcs **pp_smu)
 {
 	if (pp_smu && *pp_smu) {
 		kfree(*pp_smu);

drivers/gpu/drm/amd/display/dc/dcn20/dcn20_resource.h

···
 	struct dc_context *ctx, uint32_t inst);
 void dcn20_dsc_destroy(struct display_stream_compressor **dsc);
 
-struct pp_smu_funcs *dcn20_pp_smu_create(struct dc_context *ctx);
-void dcn20_pp_smu_destroy(struct pp_smu_funcs **pp_smu);
-
 struct hubp *dcn20_hubp_create(
 	struct dc_context *ctx,
 	uint32_t inst);

drivers/gpu/drm/amd/display/dc/dcn21/dcn21_resource.c

···
 		SE_COMMON_MASK_SH_LIST_DCN20(_MASK)
 };
 
+static void dcn21_pp_smu_destroy(struct pp_smu_funcs **pp_smu);
+
 static struct input_pixel_processor *dcn21_ipp_create(
 	struct dc_context *ctx, uint32_t inst)
 {
···
 		dcn_dccg_destroy(&pool->base.dccg);
 
 	if (pool->base.pp_smu != NULL)
-		dcn20_pp_smu_destroy(&pool->base.pp_smu);
+		dcn21_pp_smu_destroy(&pool->base.pp_smu);
 }