wifi: iwlwifi: pcie: move gen1 TB handling to header

We will need this in another place soon in reclaim and init,
so add this function to the queue header file instead.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Gregory Greenman <gregory.greenman@intel.com>
Link: https://lore.kernel.org/r/20230816104355.52b6f66de219.Ic8403fd098c187fac067977808c0129d96514c91@changeid


Signed-off-by: Johannes Berg <johannes.berg@intel.com>