uilt in (usually
in multimachine config). SA1100 driver already has similar check.

Signed-off-by: Dmitry Artamonow <mad_soft@inbox.ru>
Acked-by: Eric Miao <eric.y.miao@gmail.com>
Acked-by: Kristoffer Ericson <kristoffer.ericson@gmail.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
cZ罞!x