Lora: small fixes

[kivaisan]

Description

Small fixes to LoRa stack

Pull request type

[X] Fix
[ ] Refactor
[ ] New target
[ ] Feature
[ ] Breaking change

[kivaisan]

@kjbracey-arm, @AnttiKauppila, @hasnainvirk, please review this.

[hasnainvirk]

@kivaisan This will need a rebase and testing again as Antti's stuff is in.

[kivaisan]

Rebased to latest mbed-os. @0xc0170 could you please start required builds / tests.

[0xc0170]

To understand this PR - there are 3 commits that look like fixes and the last one as adding new functionality that can be separate PR (feature) ?
/morph build

[kivaisan]

@0xc0170 this PR is now just those small fixes. I'll create a new PR (feature) about the new receive API.

[mbed-ci]

Build : SUCCESS

Build number : 1700
Build artifacts/logs : http://mbed-os.s3-website-eu-west-1.amazonaws.com/?prefix=builds/6569/

Triggering tests

/morph test
/morph uvisor-test
/morph export-build
/morph mbed2-build

[mbed-ci]

Exporter Build : SUCCESS

Build number : 1334
Build artifacts/logs : http://mbed-os.s3-website-eu-west-1.amazonaws.com/?prefix=builds/exporter/6569/

[cmonr]

Restarting build since commits were updated after last build was started.

/morph build

[mbed-ci]

Build : SUCCESS

Build number : 1709
Build artifacts/logs : http://mbed-os.s3-website-eu-west-1.amazonaws.com/?prefix=builds/6569/

Triggering tests

/morph test
/morph uvisor-test
/morph export-build
/morph mbed2-build

[mbed-ci]

Exporter Build : SUCCESS

Build number : 1343
Build artifacts/logs : http://mbed-os.s3-website-eu-west-1.amazonaws.com/?prefix=builds/exporter/6569/

[mbed-ci]

Test : FAILURE

Build number : 1504
Test logs :http://mbed-os-logs.s3-website-us-west-1.amazonaws.com/?prefix=logs/6569/1504

[0xc0170]

Sync failues for one device, I noticed this this morning, I restarted another job, will wait for results and this might need reconnect

@studavekar

[0xc0170]

/morph test

[mbed-ci]

Test : SUCCESS

Build number : 1518
Test logs :http://mbed-os-logs.s3-website-us-west-1.amazonaws.com/?prefix=logs/6569/1518

[adbridge]

This edits code introduced by #6411 which is targeting 5.9, thus this cannot go to a patch release.