Cellular: Fix Gemalto/Cinterion driver

[AriParkkila]

Summary of changes

Fix #11760

Fix #12074

Added also missing cellular properties in GEMALTO_CINTERION.cpp.

Impact of changes

Migration actions required

Documentation

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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

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

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Reviewers

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[ciarmcom]

@AriParkkila, thank you for your changes.
@ARMmbed/mbed-os-wan @ARMmbed/mbed-os-maintainers please review.

[mbed-ci]

Test run: SUCCESS

Summary: 11 of 11 test jobs passed
Build number : 1
Build artifacts

[adbridge]

@AriParkkila I'll let this one through as it is already at the ready to merge state but please note in future to read our PR submission guidelines. PRs should contain 1 self contained fix only and the description should document what the issue is and how it is being fixed by the PR...