iwlwifi: pcie: get rid of q->n_bd

This variable always tracks a constant value (256) so there's
no need to have it. Removing it simplifies code generation,
reducing the .text size (by about 240 bytes on x86-64.)

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>

diff --cc drivers/net/wireless/iwlwifi/pcie/internal.h
Simple merge

diff --cc drivers/net/wireless/iwlwifi/pcie/rx.c
Simple merge

diff --cc drivers/net/wireless/iwlwifi/pcie/trans.c
Simple merge

diff --cc drivers/net/wireless/iwlwifi/pcie/tx.c
Simple merge