zephyr: Replace <zephyr/zephyr.h> with <zephyr/kernel.h>.

[danicampora]

Also replace deprecated macro (FLASH_AREA_LABEL_EXISTS) that was causing the pre-processor to fail. This is all required to be compatible with newer releases of Zephyr (at least up to V3.6.0)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.42%. Comparing base (d7d77d9) to head (39af74a).
Report is 3 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master   #15291   +/-   ##
=======================================
  Coverage   98.42%   98.42%           
=======================================
  Files         161      161           
  Lines       21204    21204           
=======================================
  Hits        20870    20870           
  Misses        334      334           

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[github-actions]

Code size report:

   bare-arm:    +0 +0.000% 
minimal x86:    +0 +0.000% 
   unix x64:    +0 +0.000% standard
      stm32:    +0 +0.000% PYBV10
     mimxrt:    +0 +0.000% TEENSY40
        rp2:    +0 +0.000% RPI_PICO_W
       samd:    +0 +0.000% ADAFRUIT_ITSYBITSY_M4_EXPRESS

[robert-hh]

Hi Daniel. Good to see you back.

[danicampora]

@robert-hh thanks! happy to be back :-)

[dpgeorge]

Nice to see you @danicampora ! You're always welcome here.

Unfortunately the CI is failing, probably because with the newer Zephyr version other things need updating, eg Bluetooth.

And actually a full update to 3.6.0 was proposed in #9335, but you can see the discussion there about the unfriendly nature of peripheral naming (you now need to specify the address of the peripheral to use it). This whole issue has yet to be resolved, but @jimmo is working on it. Hopefully soon we can update to 3.6.0.

[dpgeorge]

If it's possible to make a change to the code so that it builds with the existing CI, and also 3.6.0, that would be best (for a short term solution).

[danicampora]

@dpgeorge thanks for pointing out #9335, I should have probably done a search before creating this pull request. I'll dive into #9335 and see how I can help.

[danicampora]

Closing this one in favor of #9335