RPi CM5: Enable DWC2 host mode support by default

[AaronDewes]

Description

This makes USB work in host mode by default on more boards. It is already the default on RPi OS: RPi-Distro/pi-gen@ca5eb62

How Has This Been Tested?

• Changed config.txt on an existing image, tested on CM5 IO board
• Changed config.txt on an existing image, tested on a custom board

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• My changes generate no new warnings

[EvilOlaf]

As long as the [cm5] tag is sufficient to not interfere with rpi4 or other boards of that family in general, should be fine.

[AaronDewes]

As long as the [cm5] tag is sufficient to not interfere with rpi4 or other boards of that family in general, should be fine.

Yes, it is: https://www.raspberrypi.com/documentation/computers/config_txt.html#conditional-filters

And as I mentioned, their official image uses exactly the same configuration.