bnxt_en: Fix and enable interrupt coalescing

[chandrakanth.patil_broadcom.com]

Summary

Added support for HWRM_RING_AGGINT_QCAPS to retrieve interrupt coalescing parameters from the
NIC and store them in dedicated driver structures, removing redundant fields.

Also enabled interrupt coalescing for Notification Queue (NQ) rings. These updates fix the
previously broken interrupt coalescing functionality and ensure proper handling for both normal
rings and NQs.