[third_party/bcmdhd] Expose logic for wstats.

Expose more constants, macros, and some logic for the proper handling of
the firmware iovar wstats_counters (per-antenna histograms).

Also there are two type fixes in bcmwifi_channels.h, where uint8 and
uint16 were accidentally used (instead of uint8_t and uint16_t).

Bug: 29698
Change-Id: I07ad8fd29d884e25afe943a039b64b7961196b71
Reviewed-on: https://fuchsia-review.googlesource.com/c/third_party/bcmdhd/+/404954
Reviewed-by: Joshua Conner <joshconner@google.com>
7 files changed