Updates docs for firmware changes for CM5 / Pi500 and other recent firmware changes.

[timg236]

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@peterharperuk @popcornmix

[nathan-contino]

lgtm, will merge when we're ready to roll out CM5. The one mention of Pi 500 is fine as a small teaser of announcements yet to come :) ... and because it's very unlikely that anyone will remember to update this firmware doc when that comes out!

[timg236]

lgtm, will merge when we're ready to roll out CM5. The one mention of Pi 500 is fine as a small teaser of announcements yet to come :) ... and because it's very unlikely that anyone will remember to update this firmware doc when that comes out!

We published the device-tree for Pi500 recently so there shouldn't be any big surprises. Happy for this to published whenever is convenient e.g. for CM5.

[nathan-contino]

incorporating a suggestion from a little birdie: flagship should use the full name. compute module prefix fine to drop; keyboard 'raspberry pi' prefix is OK to drop if we have already used a fully qualified flagship model name to reduce fatigue.

[timg236]

Thanks, this looks more compact now and should be unambiguous to readers