V4L/DVB (9143): af9015: fix wrong GPIO

- fix wrong GPIO that causes 2nd FE not to work ater warmboot

Thanks to Andrew Williams <andrew.williams@joratech.com> for reporting this.

Signed-off-by: Antti Palosaari <crope@iki.fi>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>