iwlwifi: wrt: add rt status and num of rx/tx fifos to dump

Add the rt status of the last assert or 0 if the dump collection was
not initiated by an assert.  Add the number of rx and tx fifos in use.
These fields are added to dump info lst file.

Signed-off-by: Shahar S Matityahu <shahar.s.matityahu@intel.com>
Signed-off-by: Luca Coelho <luciano.coelho@intel.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>