ARM: mach-shmobile: clock-sh7372: fixup pllc2 set_rate

This patch fixup 421b446a
 - Care clk->rate
 - Don't over write PLLC2 enable bit
Signed-off-by: NKuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Reported-by: NGuennadi Liakhovetski <g.liakhovetski@gmx.de>
Tested-by: NGuennadi Liakhovetski <g.liakhovetski@gmx.de>
Signed-off-by: NPaul Mundt <lethal@linux-sh.org>

arch/arm/mach-shmobile/clock-sh7372.c

@@ -234,7 +234,9 @@ static int pllc2_set_rate(struct clk *clk, unsigned long rate)
 
 	value = __raw_readl(PLLC2CR) & ~(0x3f << 24);
 
-	__raw_writel((value & ~0x80000000) | ((idx + 19) << 24), PLLC2CR);
+	__raw_writel(value | ((idx + 19) << 24), PLLC2CR);
+
+	clk->rate = clk->freq_table[idx].frequency;
 
 	return 0;
 }