bnxt_en: Thor2 Ring counters not incrementing during traffic
The ctx_hw_stats_ext DMA address was not correctly passed to the
firmware during the HWRM_STAT_CTX_ALLOC allocation, causing stats to not
populate for Thor2. Passing the correct DMA length resolved the issue
MFC-After: 3 days
Differential-Revision: https://reviews.freebsd.org/D49732
(cherry picked from commit fec0e2064818f991867c9851a837012ea31774da)