sh: clkfwk: Add a followparent_recalc() helper.

This adds a followparent_recalc() helper for clocks that just follow the
parent's rate. Switch over the few CPUs that use this scheme for some of
their clocks.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>

arch/sh/kernel/cpu/sh2a/clock-sh7203.c

@@ -66,13 +66,8 @@ static struct clk_ops sh7203_bus_clk_ops = {
 	.recalc		= bus_clk_recalc,
 };
 
-static unsigned long cpu_clk_recalc(struct clk *clk)
-{
-	return clk->parent->rate;
-}
-
 static struct clk_ops sh7203_cpu_clk_ops = {
-	.recalc		= cpu_clk_recalc,
+	.recalc		= followparent_recalc,
 };
 
 static struct clk_ops *sh7203_clk_ops[] = {