wifi_statistics: rename module to wifi_statistics.ko

to make everything consistent also the final modules
should be called wifi_statistics like it is written
everywhere

Signed-off-by: Antonio Quartulli <ordex@autistici.org>
wifi_statistics: remove useless blank lines

Signed-off-by: Antonio Quartulli <ordex@autistici.org>
wifi_statistics: fix typo in README

Signed-off-by: Antonio Quartulli <ordex@autistici.org>
wifi_statistics: pull the correct amount of data

Signed-off-by: Antonio Quartulli <ordex@autistici.org>
wifi_statistics: use ETH_ALEN when possible

Signed-off-by: Antonio Quartulli <ordex@autistici.org>