drm/radeon: comment out some currently unused btc dpm code

Keep it around for reference.
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/radeon/btc_dpm.c

@@ -2277,6 +2277,7 @@ static void btc_update_requested_ps(struct radeon_device *rdev,
 	eg_pi->requested_rps.ps_priv = &eg_pi->requested_ps;
 }
 
+#if 0
 void btc_dpm_reset_asic(struct radeon_device *rdev)
 {
 	rv770_restrict_performance_levels_before_switch(rdev);
@@ -2284,6 +2285,7 @@ void btc_dpm_reset_asic(struct radeon_device *rdev)
 	btc_set_boot_state_timing(rdev);
 	rv770_set_boot_state(rdev);
 }
+#endif
 
 int btc_dpm_pre_set_power_state(struct radeon_device *rdev)
 {