V4L/DVB (3281): av7110 driver: improved recovery from ARM crash and crash detection

- Improved recovery from ARM crash and the way a crash is detected.
Minor white space clean-up, debug output fixed.

Signed-off-by: Oliver Endriss <o.endriss@gmx.de>
Signed-off-by: Mauro Carvalho Chehab <mchehab@brturbo.com.br>