LoRa: Fix MAC initialization for connection with parameters

[kivaisan]

Description

LoRaMAC was not initialized properly if application called
connect(const lorawan_connect_t &connect);

This causes problems for example in case where application
first disconnects and then reconnects as counter values are not
initialized.

This fixes #7759.

Pull request type

[X] Fix
[ ] Refactor
[ ] Target update
[ ] Feature
[ ] Breaking change

[kivaisan]

@hasnainvirk @AnttiKauppila @kjbracey-arm please review.

[cmonr]

Going to try and target this for the next patch, but it's possible this might be fixing something that's going in 5.10.

/morph build

[mbed-ci]

Build : SUCCESS

Build number : 2784
Build artifacts/logs : http://mbed-os.s3-website-eu-west-1.amazonaws.com/?prefix=builds/7770/

Triggering tests

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

[mbed-ci]

Exporter Build : SUCCESS

Build number : 2415
Build artifacts/logs : http://mbed-os.s3-website-eu-west-1.amazonaws.com/?prefix=builds/exporter/7770/

[mbed-ci]

Test : FAILURE

Build number : 2521
Test logs :http://mbed-os-logs.s3-website-us-west-1.amazonaws.com/?prefix=logs/7770/2521

[kivaisan]

Test failure does not seem to relate this PR. Could you please restart the test?

[adbridge]

/morph test

[cmonr]

CI had an issue a few hours ago.
/morph test

[mbed-ci]

Test : FAILURE

Build number : 2541
Test logs :http://mbed-os-logs.s3-website-us-west-1.amazonaws.com/?prefix=logs/7770/2541

[cmonr]

/morph test

[mbed-ci]

Test : FAILURE

Build number : 2564
Test logs :http://mbed-os-logs.s3-website-us-west-1.amazonaws.com/?prefix=logs/7770/2564

[cmonr]

/morph test

[cmonr]

Restarting since the test hit an issue that is now fixed in master.

/morph test

[mbed-ci]

Test : SUCCESS

Build number : 2574
Test logs :http://mbed-os-logs.s3-website-us-west-1.amazonaws.com/?prefix=logs/7770/2574

[cmonr]

Ended up being based off of prior changes going into 5.10.