Ageout flush does not happen for WBM2SW4 if there
is only one TX completion pending in FIFO and all the
other WBM release rings are not active. This is due to
an issue in HW and this prevents suspend to happen due
to pending tx completions.
Fix is to avoid using WBM2SW4 release ring and instead
reuse WBM2SW0.
Change-Id: I250d8c9d460895449939212ebdb7abd62edb0234
CRs-Fixed: 3124733
c467daf31c