ARM: dts: omap4: Fix aes entry

OMAP4 has a second aes module, so let's use proper name for
the first instance.

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>