staging: fix typos "aquire" -> "acquire"

This patch was generated by

    git grep -E -i -l '[Aa]quire' drivers/staging | xargs -r perl -p -i -e 's/([Aa])quire/$1cquire/'

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