ARM: dts: Fix omap4 system timer source clocks

I accidentally flipped the system timer to use system clock instead of
the 32k source clock.

Fixes: 14b1925a72 ("ARM: dts: Configure system timers for omap4")
Signed-off-by: Tony Lindgren <tony@atomide.com>

arch/arm/boot/dts/omap4.dtsi

@@ -662,6 +662,6 @@
 	ti,no-idle;
 	timer@0 {
 		assigned-clocks = <&l4_wkup_clkctrl OMAP4_TIMER1_CLKCTRL 24>;
-		assigned-clock-parents = <&sys_clkin_ck>;
+		assigned-clock-parents = <&sys_32k_ck>;
 	};
 };