ARM: dts: omap4.dtsi: remove aes[12]_fck

"aes1_fck" and "aes2_fck" are controlled by hwmod. Drop clock
entries to avoid conflicts.

Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.co.uk>
Acked-by: Tero Kristo <t-kristo@ti.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>