This fixes a warning on several pxa based machines:

	arch/arm/mach-pxa/ssp.c:475: warning: initialization discards qualifiers from pointer target type
Signed-off-by: NUwe Kleine-König <u.kleine-koenig@pengutronix.de>
Acked-by: NVikram Dhillon <dhillonv10@gmail.com>
Acked-by: NEric Miao <eric.y.miao@gmail.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>