V4L/DVB (4864): TDA826x I2C read with 2 messages

Added a dump I2C message to the TDA826x-driver to fix I2C read for
identification with ttusb2-driver.

Signed-off-by: Patrick Boettcher <pb@linuxtv.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>