ARM: socfpga: Turn on ARM errata for L2 cache

Turn on these ARM and PL310 errata for SoCFPGA:

ARM_ERRATA_754322
ARM_ERRATA_764369
ARM_ERRATA_775420

PL310_ERRATA_588369
PL310_ERRATA_727915
PL310_ERRATA_753970
PL310_ERRATA_769419

Signed-off-by: Clément Péron <peron.clem@gmail.com>
Signed-off-by: Dinh Nguyen <dinguyen@kernel.org>