ARM: l2c: provide common PL310 early resume code

Provide a common assembly implementation for PL310 resume code.  Certain
platforms need to re-initialise the L2C cache early as it may preserve
data across a S2RAM cycle, and therefore must be enabled along with the
L1 cache and MMU.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

diff --cc arch/arm/mm/Makefile
Simple merge

diff --cc arch/arm/mm/l2c-l2x0-resume.S
Simple merge