Disable 80MHz and UNII channels

[drbild]

To comply with our FCC certification for external antennas, we need to disable the following WiFi channels and modes:

• UNII bands 5260-5320 MHz
• UNII bands 5500-5720 MHz
• UNII 80 MHz modes

I see two approaches for doing this:

Option 1 - Wifi Module Firmware:

Request a custom CLM blob for the wifi module from Murata to replace the default one here.

I've some materials and contacts from Murata that we could use to pursue this approach.

Option 2 - Custom Wireless Reg DB

The allow channels and frequenencies are controlled by the wireless regulatory database. See here.

We can create a custom version of this config that disables those bands for the US and Canadian regions. See the "TX Power" section here for an example of compiling a custom wireless db. For buildroot, we would replace this package with a custom one.