[media] cxd2841er: fix BER report via DVBv5 stats API

What userspace expects is to receive both bit_error and bit_count
counters. So, instead of doing the division at the Kernel,
return the counters for userspace to handle it the way it
wants.

Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>