Enable Raspberry Touch 2 rotation with overlay

[foonerd]

The panel-ilitek-ili9881c.c which Touch Display 2 is based on already contains orientation.
By minor update to the vc4-kms-dsi-ili9881-7inch-overlay.dts panel can be rotated with minimal effort.

Issue opened here:
raspberrypi/documentation#3923

Complete discussion and working dbto in the community thread:
https://community.volumio.com/t/guide-official-raspberry-touch-display-2/69791

[6by9]

Commits should include a commit text and Signed-off-by: line., but otherwise looks reasonable.

[foonerd]

@6by9
For my benefit, the commit line should be:
dtoverlays: Enable Raspberry Touch 2 rotation

Did I get this right?

Who should be listed as "Signed-off-by: "?

[6by9]

Signed-off-by: is documented in https://www.kernel.org/doc/html/latest/process/submitting-patches.html#sign-your-work-the-developer-s-certificate-of-origin

It should match the commit author in this case. For upstream both would need use your real name rather than any nickname, but for dtoverlays that isn't as critical.

[6by9]

The patches get applied to the tree exactly as they are presented in the PR. The 3 changes therefore want to get squashed into one, and force pushed (git push -f ... ) to your Github branch.

[foonerd]

I see. Lets close this PR and open another, correct one. - Do you agree?

[pelwell]

No - if the end result is one patch then we can squash at the point of merging.

[foonerd]

Thanks. In such case, is there anything else needed from me at this point?

[pelwell]

I think we're good - I'll just give it the once over then merge.