Cellular: Gemalto TCP Socket support

[kivaisan]

Description

Add TCP socket support for Gemalto cellular modem driver.

Pull request type

[ ] Fix
[ ] Refactor
[x] Target update
[ ] Functionality change
[ ] Docs update
[ ] Test update
[ ] Breaking change

[kivaisan]

@AriParkkila @jarvte @mirelachirica please review.

[cmonr]

Info @ARMmbed/mbed-os-maintainers: Marking this for next patch since this is a target update.

[0xc0170]

@ARMmbed/mbed-os-wan Waiting for your review

[0xc0170]

[X] Functionality change

In this case, this is target update - updating target implementation

[cmonr]

@mbed-os-wan @antiiv01 @mirelachirica @jarvte

Thoughts?

[0xc0170]

/morph build

[mbed-ci]

Build : SUCCESS

Build number : 3463
Build artifacts/logs : http://mbed-os.s3-website-eu-west-1.amazonaws.com/?prefix=builds/8440/

Triggering tests

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

[cmonr]

IAR network license issue.
Restarting.
/morph mbed2-build

[mbed-ci]

Test : FAILURE

Build number : 3254
Test logs :http://mbed-os-logs.s3-website-us-west-1.amazonaws.com/?prefix=logs/8440/3254

[mbed-ci]

Exporter Build : SUCCESS

Build number : 3086
Build artifacts/logs : http://mbed-os.s3-website-eu-west-1.amazonaws.com/?prefix=builds/exporter/8440/

[cmonr]

It's possible that the network slowed to a crawl with this test.
Retesting to verify.
/morph test

[mbed-ci]

Test : SUCCESS

Build number : 3263
Test logs :http://mbed-os-logs.s3-website-us-west-1.amazonaws.com/?prefix=logs/8440/3263

[adbridge]

This sits on top of #8295 which is scheduled for 5.11