ARM: 5920/1: OMAP4: Enable L2 Cache

This patch enables L2 cache and associated Errata on the
OMAP4430 SDP.

Signed-off-by: Santosh Shilimkar <santosh.shilimkar@ti.com>
Acked-by: Tony Lindgren <tony@atomide.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>