V4L/DVB (5424): Fix i2c implementation for gl861 and au6610

- r/w bit is not part of the i2c address

Signed-off-by: Aapo Tahkola <aet@rasterburn.org>
Signed-off-by: Michael Krufky <mkrufky@linuxtv.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>