drm/amd/display: make some functions static

These functions are not used outside the file dcn32_hubbub.c, so the
modification is defined as static.

drivers/gpu/drm/amd/amdgpu/../display/dc/dcn32/dcn32_hubbub.c:912:6: warning: no previous prototype for ‘hubbub32_force_wm_propagate_to_pipes’.
drivers/gpu/drm/amd/amdgpu/../display/dc/dcn32/dcn32_hubbub.c:823:6: warning: no previous prototype for ‘hubbub32_wm_read_state’.
drivers/gpu/drm/amd/amdgpu/../display/dc/dcn32/dcn32_hubbub.c:772:6: warning: no previous prototype for ‘hubbub32_init_watermarks’.
drivers/gpu/drm/amd/amdgpu/../display/dc/dcn32/dcn32_hubbub.c:712:6: warning: no previous prototype for ‘hubbub32_force_usr_retraining_allow’.

Link: https://bugzilla.openanolis.cn/show_bug.cgi?id=2141Reported-by: Abaci Robot <abaci@linux.alibaba.com>
Signed-off-by: Jiapeng Chong <jiapeng.chong@linux.alibaba.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/display/dc/dcn32/dcn32_hubbub.c

@@ -709,7 +709,7 @@ static bool hubbub32_program_usr_watermarks(
 	return wm_pending;
 }
 
-void hubbub32_force_usr_retraining_allow(struct hubbub *hubbub, bool allow)
+static void hubbub32_force_usr_retraining_allow(struct hubbub *hubbub, bool allow)
 {
 	struct dcn20_hubbub *hubbub2 = TO_DCN20_HUBBUB(hubbub);
 
@@ -769,7 +769,7 @@ static bool hubbub32_program_watermarks(
 }
 
 /* Copy values from WM set A to all other sets */
-void hubbub32_init_watermarks(struct hubbub *hubbub)
+static void hubbub32_init_watermarks(struct hubbub *hubbub)
 {
 	struct dcn20_hubbub *hubbub2 = TO_DCN20_HUBBUB(hubbub);
 	uint32_t reg;
@@ -820,7 +820,7 @@ void hubbub32_init_watermarks(struct hubbub *hubbub)
 	REG_WRITE(DCHUBBUB_ARB_FCLK_PSTATE_CHANGE_WATERMARK_D, reg);
 }
 
-void hubbub32_wm_read_state(struct hubbub *hubbub,
+static void hubbub32_wm_read_state(struct hubbub *hubbub,
 		struct dcn_hubbub_wm *wm)
 {
 	struct dcn20_hubbub *hubbub2 = TO_DCN20_HUBBUB(hubbub);
@@ -909,7 +909,7 @@ void hubbub32_wm_read_state(struct hubbub *hubbub,
 			DCHUBBUB_ARB_FCLK_PSTATE_CHANGE_WATERMARK_D, &s->fclk_pstate_change);
 }
 
-void hubbub32_force_wm_propagate_to_pipes(struct hubbub *hubbub)
+static void hubbub32_force_wm_propagate_to_pipes(struct hubbub *hubbub)
 {
 	struct dcn20_hubbub *hubbub2 = TO_DCN20_HUBBUB(hubbub);
 	uint32_t refclk_mhz = hubbub->ctx->dc->res_pool->ref_clocks.dchub_ref_clock_inKhz / 1000;