RAK4630 LoRaWAN Allow change TCXO control adding it as a parameter

[hallard]

Summary of changes

RAK4630 with Nordic nrf52840 + Semtech SX1262 need change with TCXO voltage, so it's now used as parameter in mbed_app.json as #15312

Documentation

• Added tcxo_ctrlas a parameter since RAK4630 need default value to be changed from TCXO_CTRL_1_7V to TCXO_CTRL_3_0V (today it was hardcoded)

            "SX126X-lora-driver.tcxo-ctrl": "TCXO_CTRL_3_0V",

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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)

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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

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Reviewers

@jeromecoutant @0xc0170

[jeromecoutant]

default code doesn't change I think

[hallard]

@jeromecoutant yeah, doing nothing (default code) just change nothing, so it should be straightforward and used only if needed

[0xc0170]

CI started

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