ARM: l2c: berlin: convert to generic l2c OF initialisation

Remove the explicit call to l2x0_of_init(), converting to the generic
infrastructure instead.  We can remove the explicit machine init too
as this becomes identical to the generic version.

Acked-by: Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>