mwifiex: fix wake on disconnect feature

Default gpio and gap is downloaded to firmware while
configuring host sleep for wake on disconnect. We may
have gpio and gap modified by user.

This patch fixes the problem.

Signed-off-by: chunfan chen <jeffc@marvell.com>
Signed-off-by: Amitkumar Karwar <akarwar@marvell.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>