[ARM] Feroceon: allow more old Feroceon IDs

There are a couple more Feroceon-based SoCs out in the field that use
different Variant and Architecture fields in their Main ID registers
-- this patch tweaks the processor match/mask in proc-feroceon.S to
catch those SoCs as well.

Signed-off-by: Ke Wei <kewei@marvell.com>
Signed-off-by: Lennert Buytenhek <buytenh@marvell.com>