MLK-16912 PL310: unlock ways during initialization

MLK-16912 PL310: unlock ways during initialization

This change affects all i.MX 6 with PL310 L2 Cache controller.
When Linux runs in Non-secure World the PL310 has already
been initialized by the ARM secure World running OP-TEE os.
However, in order to have a proper Linux Initialization all the
L2 cache ways have been locked by the secure world.

This patch unlock all the ways during pl310 initialization.

Signed-off-by: Cedric Neveux <cedric.neveux@nxp.com>
(cherry picked from commit be7971b62e0c77cf70f828868a5d5a4184a926d2)