STM32F2/F4/F7 : LL API is now available for IRQ

[jeromecoutant]

Description

Since LL API from ST Cube is now available for all STM32 families,
We can clean some workaround done some time ago.

Pull request type

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

[0xc0170]

/morph build

[mbed-ci]

Build : FAILURE

Build number : 2632
Build artifacts/logs : http://mbed-os.s3-website-eu-west-1.amazonaws.com/?prefix=builds/7539/

[cmonr]

/morph build

[mbed-ci]

Build : FAILURE

Build number : 2634
Build artifacts/logs : http://mbed-os.s3-website-eu-west-1.amazonaws.com/?prefix=builds/7539/

[cmonr]

Going to try this again since CI is now quiet.

/morph build

[cmonr]

Derp. Wrong PR...

[0xc0170]

we will restart the build once CI license issue is resolved (currently testing one build job)

[cmonr]

/morph build

[mbed-ci]

Build : SUCCESS

Build number : 2644
Build artifacts/logs : http://mbed-os.s3-website-eu-west-1.amazonaws.com/?prefix=builds/7539/

Triggering tests

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

[mbed-ci]

Exporter Build : SUCCESS

Build number : 2277
Build artifacts/logs : http://mbed-os.s3-website-eu-west-1.amazonaws.com/?prefix=builds/exporter/7539/

[mbed-ci]

Test : SUCCESS

Build number : 2383
Test logs :http://mbed-os-logs.s3-website-us-west-1.amazonaws.com/?prefix=logs/7539/2383