ARM: OMAP4: Add L2 Cache Controller in Device Tree

Provide PL310 Level 2 Cache Controller Device Tree
support for OMAP4 based devices.

Signed-off-by: Santosh Shilimkar <santosh.shilimkar@ti.com>
Acked-by: Felipe Balbi <balbi@ti.com>
Signed-off-by: Benoit Cousson <b-cousson@ti.com>