drm/radeon/cik: restructure rlc setup

Restructure rlc setup to handle clock and power
gating.

Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
diff --git a/drivers/gpu/drm/radeon/si.c b/drivers/gpu/drm/radeon/si.c
index daa8d2d..610adfc 100644
--- a/drivers/gpu/drm/radeon/si.c
+++ b/drivers/gpu/drm/radeon/si.c
@@ -5435,7 +5435,7 @@
 	return 0;
 }
 
-static void si_rlc_reset(struct radeon_device *rdev)
+void si_rlc_reset(struct radeon_device *rdev)
 {
 	u32 tmp = RREG32(GRBM_SOFT_RESET);