V4L/DVB (3198): make cx25840 recover from some firmware load failures

- In the rare event that a 333MHz i2c firmware load fails after
writing some data, this fix makes the driver reset the DL_ADDR
registers to the proper values before continuing on with 100MHz
transfers.

Signed-off-by: Tyler Trafford <tatrafford@comcast.net>
Signed-off-by: Mauro Carvalho Chehab <mchehab@brturbo.com.br>