staging: fix typos "enalbe" -> "enable"

This patch was generated by

	git grep -E -l 'enalbe' drivers/staging | xargs -r perl -p -i -e 's/enalbe/enable/g'

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>