omap2 clock: clean up dss2_fck clock flags

dss2_fck is not a fixed-rate clock; its rate is dependent on its parent's
rate.  So, drop the .rate assignment and drop the RATE_FIXED clock flag.
It also is a leaf clock - no clocks have it as a parent - so it can't
propagate its rate anywhere.  So, drop the RATE_PROPAGATES and fix the
recalc function pointer accordingly.
Signed-off-by: Paul Walmsley <paul@pwsan.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>

arch/arm/mach-omap2/clock.h

@@ -1059,12 +1059,10 @@ static struct clk dss2_fck = {		/* Alt clk used in power management */
 static struct clk dss_54m_fck = {	/* Alt clk used in power management */
 	.name		= "dss_54m_fck",	/* 54m tv clk */
 	.parent		= &func_54m_ck,
-	.rate		= 54000000,
-	.flags		= CLOCK_IN_OMAP242X | CLOCK_IN_OMAP243X |
-				RATE_FIXED | RATE_PROPAGATES,
+	.flags		= CLOCK_IN_OMAP242X | CLOCK_IN_OMAP243X,
 	.enable_reg	= OMAP_CM_REGADDR(CORE_MOD, CM_FCLKEN1),
 	.enable_bit	= OMAP24XX_EN_TV_SHIFT,
-	.recalc		= &omap2_propagate_rate,
+	.recalc		= &omap2_followparent_recalc,
 };
 
 /*