Improve nrfx-blink-sdk example to automatically get Zephyr defines and show using nrfutil instead of nrfjprog

[xtremekforever]

@kubamracek I figured out how to get the Zephyr defines programmatically in CMakeLists.txt so that they don't have to be hardcoded. Please have a look!

1. Instead of manually setting the compiler defines that Zephyr provides (-D__ZEPHYR__=1, -DKERNEL, etc), we dynamically grab them from the zephyr_interface INTERFACE_COMPILE_DEFINITIONS and set -Xcc flags for Swift compilation instead.
2. The nRF Command Line Tools are deprecated and have been replaced by the nRF Util tool instead. As such, I've updated the README.md to show using nrfutil instead of nrfjprog.

@rauhul I have also been working on an Integration with Zephyr document for this repo, but still in progress. I'm hoping to have something soon in the next few weeks that we can look at.

[rauhul]

Ignore the "Update Swift Version / Create or update PR (pull_request)" failure. That workflow shouldn't run on PRs, the fix is here: #131

[rauhul]

@kubamracek can you review this one?

[rauhul]

@xtremekforever it looks like the zephyr build is broken due to an upstream change, and im not sure how to resolve it. is this something you could look into?

[rauhul]

I'm disabling CI for Zephyr here to unblock other PRs: #136

[xtremekforever]

@xtremekforever it looks like the zephyr build is broken due to an upstream change, and im not sure how to resolve it. is this something you could look into?

Is it from a Zephyr change or a Swift change? I've run into issues when checking out newer Zephyr versions before, so I ended up locking it to v4.1 for all my workspaces.

[rauhul]

@xtremekforever it looks like the zephyr build is broken due to an upstream change, and im not sure how to resolve it. is this something you could look into?

Is it from a Zephyr change or a Swift change? I've run into issues when checking out newer Zephyr versions before, so I ended up locking it to v4.1 for all my workspaces.

Seems to be a zephyr change, do you think you could help us pin the zephyr version(s) used in this repo? I'm not familiar with all the places pins are needed.

[xtremekforever]

Sure @rauhul let me have a look tonight. If I find a solution I can PR separately to this repo to fix the issue.