[media] lgdt3306a: Use IS_ENABLED() for attach function

Simplify the check if CONFIG_DVB_LGDT3306A is enabled, use the
IS_ENABLED() macro, just like the other frontend modules.

Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>

diff --cc drivers/media/dvb-frontends/lgdt3306a.c
Simple merge

diff --cc drivers/media/dvb-frontends/lgdt3306a.h
Simple merge