[ARM] 4530/1: MXC: fix elf_hwcap compile breakage as in iop13xx

[ARM] 4530/1: MXC: fix elf_hwcap compile breakage as in iop13xx

MXC needs the same change as IOP.  See [ARM] 4494/1
or commit df78faaadd6a40e5454b981d74c7fcfba9b26198

An undefined reference to elf_hwcap prevents linkage, due
to changes made by 81979a01b5f4b9574ab1f232fbd4b7f6852342da
and b9716e532648857ceb8fcea5ae36ff17ce1d2ce0

Removing processor.h removes the extern definition of
elf_hwcap, which fixes the link issue, but forgets cpu_relax().
So, instead, we'll call barrier() directly.

Cc: Lennert Buytenhek <kernel@wantstofly.org>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Acked-by: Ross Wille <wille@freescale.com>
Signed-off-by: Quinn Jensen <quinn.jensen@freescale.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>