drm/amd/pm: remove unused declarations in hardwaremanager.h

phm_is_hw_access_blocked() and phm_block_hw_access() has been
removed since commit 698f88e6 ("drm/amd/powerplay: delete
dead code in powerplay"), so remove them.
Acked-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Gaosheng Cui <cuigaosheng1@huawei.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220913024847.552254-6-cuigaosheng1@huawei.com

drivers/gpu/drm/amd/pm/powerplay/inc/hardwaremanager.h

@@ -401,8 +401,6 @@ extern int phm_powerdown_uvd(struct pp_hwmgr *hwmgr);
 extern int phm_setup_asic(struct pp_hwmgr *hwmgr);
 extern int phm_enable_dynamic_state_management(struct pp_hwmgr *hwmgr);
 extern int phm_disable_dynamic_state_management(struct pp_hwmgr *hwmgr);
-extern bool phm_is_hw_access_blocked(struct pp_hwmgr *hwmgr);
-extern int phm_block_hw_access(struct pp_hwmgr *hwmgr, bool block);
 extern int phm_set_power_state(struct pp_hwmgr *hwmgr,
 		    const struct pp_hw_power_state *pcurrent_state,
 		 const struct pp_hw_power_state *pnew_power_state);