BLE: fix CCC callback not being called when writing to a CCC

[paul-szczepanek-arm]

Description

When creating a CCC manually the special handling of the attribute creation for CCC would set the correct CCC flag but then normal handling would also include the normal handling causing the setting for writable enabling the write callback which takes precedence. This fix removes that callback thus allowing the CCC callback to happen.

Pull request type

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

Reviewers

Release Notes

[paul-szczepanek-arm]

@cy-kishore please comment

[ciarmcom]

@paul-szczepanek-arm, thank you for your changes.
@ARMmbed/mbed-os-pan @ARMmbed/mbed-os-maintainers please review.

[cy-kishore]

Hi,
After this fix, for explicit ccc descriptor when a client does read or write to cccd which application callback gets called? will onUpdatesEnabled and onUpdatesDisabled callbacks get called?

[cy-kishore]

Hi,
We have verified our use case with this fix and it is working. Please merge the same.

[mbed-ci]

Test run: SUCCESS

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