802.15.4 STM S2LP driver update

[artokin]

Summary of changes

Sync with v1.0.3 in master repository.

Allow usage of custom target TARGET_MTB_STM_S2LP_CT.

Impact of changes

Migration actions required

Documentation

---

Pull request type

[x] Patch update (Bug fix / Target update / Docs update / Test update / Refactor)
[] Feature update (New feature / Functionality change / New API)
[] Major update (Breaking change E.g. Return code change / API behaviour change)

---

Test results

[] No Tests required for this change (E.g docs only update)
[x] Covered by existing mbed-os tests (Greentea or Unittest)
[] Tests / results supplied as part of this PR

---

Reviewers

@JarkkoPaso

---

[MarceloSalazar]

I believe we shouldn't add custom configuration/defines to the drivers.
Instead, please use mbed_app.json to configure pin config in the application - this will let us remove target dependencies in Mbed OS.
See example for esp8266-driver

[artokin]

@MarceloSalazar , can configuration/define change be done in another PR?
We would like to enable custom target first to verify we get target to our CI correctly. When that phase is completed we could continue with additional optimisation.

[MarceloSalazar]

You certainly can, but we need to move away from custom config in drivers asap and this file will be modified again. Every PR requires review, testing and time ;-)

@0xc0170 let us know if you think we can proceed as it's

[0xc0170]

As it is already there , lets get this in and will be fixed - @artokin can you create a tracking issue for this ?

[artokin]

Sure, the issue is: https://jira.arm.com/browse/IOTTHD-4097

[mbed-ci]

Test run: SUCCESS

Summary: 6 of 6 test jobs passed
Build number : 1
Build artifacts

[MarceloSalazar]

Let's go ahead as it's. Target removal will be done on separate PR.