bnxt: propagate RSS hash type to the network stack.

RSS hash type will be used to identify the CPU on to which, a receive packet
will be queued. This patch extracts the "RSS hash type" from the receive
completion and sends it to the stack.

Submitted by: Venkatkumar Duvvuru <venkatkumar.duvvuru@broadcom.com>
Reviewed by: shurd
Approved by: sbruno
MFC after: 1 week
Sponsored by: Broadcom Limited
Differential Revision: https://reviews.freebsd.org/D9685