GiGA Touch - Allow us to define a callback function and add a forward…

[KurtE]

Add a callback function for the touch device
within the fixups for the GIGA. This callback
simply remembers the last touch that happened and
sets a semaphore.

There is also a function added to retrieve this data.

Needed to add the callback function into the exports file.

EDIT: As I mentioned in
#92

This is maybe not a complete setup yet. Currently the zephyr touch device is configured for only one touch
Where it believe is supposed to support up to 5. Also with it only doing one touch, it does not support
gestures. I will integrate our WIP touch code into the Arduino_GIGATouch library such that it is all
available for us or others to fill this in.

This is a replacement for #134
...
See that one for more details, like, I have an open PR for the touch library to work on zephyr...
arduino-libraries/Arduino_GigaDisplayTouch#14

[KurtE]

Oh Joy... Looks like now trying to make PRs about as fun as doing them for Zephyr...

Now deciding if worth...

[pillo79]

@KurtE apologies for the issues, I was in a rush to complete the next release and cut some corners with disastrous consequences. 💥
The current CI issues in this PR are caused by a wrong commit on main that has since been fixed. Please rebase your PR over the latest commit, and all should be fine.

[KurtE]

@KurtE apologies for the issues, I was in a rush to complete the next release and cut some corners with disastrous consequences. 💥 The current CI issues in this PR are caused by a wrong commit on main that has since been fixed. Please rebase your PR over the latest commit, and all should be fine.

Not a problem:

Done. Also other blinky-blink changes, like making sure no comment line in commit > 75 characters.

Question: Should we close out the PR this replaces? I am guessing yes, but.

P.S - I don't like this signoff stuff! I purposely did not have my full name and email address public on Github, but those
are required for all PRs...

And the checkpatch stuff is a PIA. Especially some styling things like:
It now errors out on:

a)
if (a != nullptr) (a)();

b)

if (a != nullptr) {
    (a)();
}

It only accepts:
c)

if (a != nullptr)
    (a)();

Whereas I believe zephyr requires b)

Sorry...