drm/amdgpu: Remove unused amdgpu_atpx functions

amdgpu_atpx_dgpu_req_power_for_displays has been unused since
commit bdb1ccb080da ("drm/amdgpu: remove ATPX_DGPU_REQ_POWER_FOR_DISPLAYS
check when hotplug-in")

amdgpu_atpx_get_dhandle has been unused since commit
f9b7f3703ff9 ("drm/amdgpu/acpi: make ATPX/ATCS structures global (v2)")

Remove them.

Signed-off-by: Dr. David Alan Gilbert <[e-mail]>
Signed-off-by: Alex Deucher <[e-mail]>

drivers/gpu/drm/amd/amdgpu/amdgpu.h

···
 void amdgpu_unregister_atpx_handler(void);
 bool amdgpu_has_atpx_dgpu_power_cntl(void);
 bool amdgpu_is_atpx_hybrid(void);
-bool amdgpu_atpx_dgpu_req_power_for_displays(void);
 bool amdgpu_has_atpx(void);
 #else
 static inline void amdgpu_register_atpx_handler(void) {}
 static inline void amdgpu_unregister_atpx_handler(void) {}
 static inline bool amdgpu_has_atpx_dgpu_power_cntl(void) { return false; }
 static inline bool amdgpu_is_atpx_hybrid(void) { return false; }
-static inline bool amdgpu_atpx_dgpu_req_power_for_displays(void) { return false; }
 static inline bool amdgpu_has_atpx(void) { return false; }
-#endif
-
-#if defined(CONFIG_VGA_SWITCHEROO) && defined(CONFIG_ACPI)
-void *amdgpu_atpx_get_dhandle(void);
-#else
-static inline void *amdgpu_atpx_get_dhandle(void) { return NULL; }
 #endif
 
 /*

drivers/gpu/drm/amd/amdgpu/amdgpu_atpx_handler.c

···
 	return amdgpu_atpx_priv.atpx.is_hybrid;
 }
 
-bool amdgpu_atpx_dgpu_req_power_for_displays(void)
-{
-	return amdgpu_atpx_priv.atpx.dgpu_req_power_for_displays;
-}
-
-#if defined(CONFIG_ACPI)
-void *amdgpu_atpx_get_dhandle(void)
-{
-	return amdgpu_atpx_priv.dhandle;
-}
-#endif
-
 /**
  * amdgpu_atpx_call - call an ATPX method
  *