sh: clkfwk: Support multi-level clock propagation.

Currently clock propagation only works for one level, but we have some
clocks which need to propagate multiple levels, so make this recursive.
Signed-off-by: NStuart Menefy <stuart.menefy@st.com>
Signed-off-by: NPaul Mundt <lethal@linux-sh.org>

arch/sh/kernel/cpu/clock.c

@@ -83,6 +83,8 @@ static void propagate_rate(struct clk *clk)
 			continue;
 		if (likely(clkp->ops && clkp->ops->recalc))
 			clkp->ops->recalc(clkp);
+		if (unlikely(clkp->flags & CLK_RATE_PROPAGATES))
+			propagate_rate(clkp);
 	}
 }