ARM: 7202/1: Add Cortex-A7 proc info

This patch adds processor info for ARM Ltd. Cortex-A7.

A7 is architecturally identical to A15 so it shares the
same SMP initialization code and hwcaps.

Tested-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Pawel Moll <pawel.moll@arm.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>