drm/amd/pm/powerplay/hwmgr/smu_helper: Demote or fix kernel-doc headers

Fixes the following W=1 kernel build warning(s):

 drivers/gpu/drm/amd/amdgpu/../pm/powerplay/hwmgr/smu_helper.c:112: warning: Function parameter or member 'hwmgr' not described in 'phm_wait_on_register'
 drivers/gpu/drm/amd/amdgpu/../pm/powerplay/hwmgr/smu_helper.c:112: warning: Function parameter or member 'index' not described in 'phm_wait_on_register'
 drivers/gpu/drm/amd/amdgpu/../pm/powerplay/hwmgr/smu_helper.c:112: warning: Function parameter or member 'value' not described in 'phm_wait_on_register'
 drivers/gpu/drm/amd/amdgpu/../pm/powerplay/hwmgr/smu_helper.c:112: warning: Function parameter or member 'mask' not described in 'phm_wait_on_register'
 drivers/gpu/drm/amd/amdgpu/../pm/powerplay/hwmgr/smu_helper.c:145: warning: Function parameter or member 'hwmgr' not described in 'phm_wait_on_indirect_register'
 drivers/gpu/drm/amd/amdgpu/../pm/powerplay/hwmgr/smu_helper.c:145: warning: Function parameter or member 'indirect_port' not described in 'phm_wait_on_indirect_register'
 drivers/gpu/drm/amd/amdgpu/../pm/powerplay/hwmgr/smu_helper.c:145: warning: Function parameter or member 'index' not described in 'phm_wait_on_indirect_register'
 drivers/gpu/drm/amd/amdgpu/../pm/powerplay/hwmgr/smu_helper.c:145: warning: Function parameter or member 'value' not described in 'phm_wait_on_indirect_register'
 drivers/gpu/drm/amd/amdgpu/../pm/powerplay/hwmgr/smu_helper.c:145: warning: Function parameter or member 'mask' not described in 'phm_wait_on_indirect_register'
 drivers/gpu/drm/amd/amdgpu/../pm/powerplay/hwmgr/smu_helper.c:494: warning: Function parameter or member 'hwmgr' not described in 'phm_initializa_dynamic_state_adjustment_rule_settings'

Cc: Evan Quan <evan.quan@amd.com>
Cc: Alex Deucher <alexander.deucher@amd.com>
Cc: "Christian König" <christian.koenig@amd.com>
Cc: David Airlie <airlied@linux.ie>
Cc: Daniel Vetter <daniel@ffwll.ch>
Cc: amd-gfx@lists.freedesktop.org
Cc: dri-devel@lists.freedesktop.org
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/pm/powerplay/hwmgr/smu_helper.c

@@ -103,7 +103,7 @@ uint32_t phm_set_field_to_u32(u32 offset, u32 original_data, u32 field, u32 size
 	return original_data;
 }
 
-/**
+/*
  * Returns once the part of the register indicated by the mask has
  * reached the given value.
  */
@@ -132,7 +132,7 @@ int phm_wait_on_register(struct pp_hwmgr *hwmgr, uint32_t index,
 }
 
 
-/**
+/*
  * Returns once the part of the register indicated by the mask has
  * reached the given value.The indirect space is described by giving
  * the memory-mapped index of the indirect index register.
@@ -486,9 +486,9 @@ int phm_get_sclk_for_voltage_evv(struct pp_hwmgr *hwmgr,
 }
 
 /**
- * Initialize Dynamic State Adjustment Rule Settings
+ * phm_initializa_dynamic_state_adjustment_rule_settings - Initialize Dynamic State Adjustment Rule Settings
  *
- * @param    hwmgr  the address of the powerplay hardware manager.
+ * @hwmgr:  the address of the powerplay hardware manager.
  */
 int phm_initializa_dynamic_state_adjustment_rule_settings(struct pp_hwmgr *hwmgr)
 {