omap2 clock: dsp_ick parent is dsp_fck, not core_ck

dsp_ick's parent clock is dsp_fck, not core_ck.  2420 TRM ES2.1.1 2.2 Rev Q
pp. 4-9, 5-28.
Signed-off-by: Paul Walmsley <paul@pwsan.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>

arch/arm/mach-omap2/clock.h

@@ -820,7 +820,7 @@ static struct clk dsp_fck = {
 
 static struct clk dsp_ick = {
 	.name		= "dsp_ick",	 /* apparently ipi and isp */
-	.parent		= &dsp_fck,
+	.parent		= &core_ck,
 	.flags		= CLOCK_IN_OMAP242X | RATE_CKCTL | CM_DSP_SEL1 |
 				DELAYED_APP | CONFIG_PARTICIPANT,
 	.rate_offset	= OMAP24XX_CLKSEL_DSP_IF_SHIFT,