iwlwifi: format and show statistics counter from uCode

iwlwifi: format and show statistics counter from uCode

To help debug uCode related problem, adding "delta" and "max"
information in debugfs statistics counters display.

Those information show the delta between two statistics report from
uCode, user can monitor the counters for any "un-normal" behavior.

Signed-off-by: Wey-Yi Guy <[email protected]>
Signed-off-by: Jay Sternberg<[email protected]>
Signed-off-by: Zhu Yi <[email protected]>
Signed-off-by: Reinette Chatre <[email protected]>
Signed-off-by: John W. Linville <[email protected]>