V4L/DVB (10168): sms1xxx: fix inverted gpio for lna control on tiger r2

The GPIO logic for LNA control on the Tiger r2 devices was inverted.
This patch corrects the problem.

Signed-off-by: Michael Krufky <mkrufky@linuxtv.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>