drm/radeon/dpm: make some functions static for TN

Noticed by Rashika Kheria and cherry-picked from
her larger patch set.

Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Cc: Rashika Kheria <rashika.kheria@gmail.com>
diff --git a/drivers/gpu/drm/radeon/trinity_dpm.c b/drivers/gpu/drm/radeon/trinity_dpm.c
index 0f4d703..2d44719 100644
--- a/drivers/gpu/drm/radeon/trinity_dpm.c
+++ b/drivers/gpu/drm/radeon/trinity_dpm.c
@@ -342,14 +342,14 @@
 					     struct radeon_ps *new_rps,
 					     struct radeon_ps *old_rps);
 
-struct trinity_ps *trinity_get_ps(struct radeon_ps *rps)
+static struct trinity_ps *trinity_get_ps(struct radeon_ps *rps)
 {
 	struct trinity_ps *ps = rps->ps_priv;
 
 	return ps;
 }
 
-struct trinity_power_info *trinity_get_pi(struct radeon_device *rdev)
+static struct trinity_power_info *trinity_get_pi(struct radeon_device *rdev)
 {
 	struct trinity_power_info *pi = rdev->pm.dpm.priv;