Revert "drm/amdgpu/display: Protect some functions with CONFIG_DRM_AMD_DC_DCN"

This reverts commit d8e4fb91.

This is no longer necessary as newer patches require these functions
without CONFIG_DRM_AMD_DC_DCN.
Reviewed-by: Harry Wentland <harry.wentland@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/display/dc/core/dc_resource.c

@@ -1801,7 +1801,6 @@ static inline void retain_hpo_dp_link_enc(
 	res_ctx->hpo_dp_link_enc_ref_cnts[enc_index]++;
 }
 
-#if defined(CONFIG_DRM_AMD_DC_DCN)
 static inline void release_hpo_dp_link_enc(
 		struct resource_context *res_ctx,
 		int enc_index)
@@ -1809,7 +1808,6 @@ static inline void release_hpo_dp_link_enc(
 	ASSERT(res_ctx->hpo_dp_link_enc_ref_cnts[enc_index] > 0);
 	res_ctx->hpo_dp_link_enc_ref_cnts[enc_index]--;
 }
-#endif
 
 static bool add_hpo_dp_link_enc_to_ctx(struct resource_context *res_ctx,
 		const struct resource_pool *pool,
@@ -1834,7 +1832,6 @@ static bool add_hpo_dp_link_enc_to_ctx(struct resource_context *res_ctx,
 	return pipe_ctx->link_res.hpo_dp_link_enc != NULL;
 }
 
-#if defined(CONFIG_DRM_AMD_DC_DCN)
 static void remove_hpo_dp_link_enc_from_ctx(struct resource_context *res_ctx,
 		struct pipe_ctx *pipe_ctx,
 		struct dc_stream_state *stream)
@@ -1848,7 +1845,6 @@ static void remove_hpo_dp_link_enc_from_ctx(struct resource_context *res_ctx,
 		pipe_ctx->link_res.hpo_dp_link_enc = NULL;
 	}
 }
-#endif
 
 /* TODO: release audio object */
 void update_audio_usage(