[ARM] Feroceon: annotate 88fr531-vd CPU entries

Annotate the entries for the 88fr531-vd CPU core in
arch/arm/boot/compressed/head.S and arch/arm/mm/proc-feroceon.S
with the full name of the core.

Signed-off-by: Lennert Buytenhek <buytenh@marvell.com>
Acked-by: Russell King <linux@arm.linux.org.uk>