omap2 clock: fix incorrect rate calculation for osc_ck, sys_ck

omap2_get_crystal_rate() calculates osc_ck and sys_ck rates
incorrectly.  osc_ck runs at the same rate as the external clock
source.  Also, sys_ck's rate derives from osc_ck's rate, divided (not
multiplied) by PRCM_CLKSRC_CTRL:SYSCLKDIV.
Signed-off-by: Paul Walmsley <paul@pwsan.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>

arch/arm/mach-omap2/clock.c

@@ -1126,8 +1126,8 @@ static void __init omap2_get_crystal_rate(struct clk *osc, struct clk *sys)
 	div &= OMAP_SYSCLKDIV_MASK;
 	div >>= sys->rate_offset;
 
-	osc->rate = sclk * div;
-	sys->rate = sclk;
+	osc->rate = sclk;
+	sys->rate = osc->rate / div;
 }
 
 /*