[third_party/bcmdhd] Include additional channel code.

Bug: 59186

Including functions that are related
to determining control channel of a given chanspec.

Change-Id: I7e1b787c41376c9ac6bb9d642f4a5bef8506ba64
Reviewed-on: https://fuchsia-review.googlesource.com/c/third_party/bcmdhd/+/427094
Reviewed-by: Karl Ward <karlward@google.com>
3 files changed