[TEST] Bundle two PRs for single CI run

[cmonr]

Description

Test PR for running multiple PRs through CI at once.
All PRs need CI and are targeting 5.10.2

• Remove GCC_CR #8304
• Fix warnings in block devices #8256

Pull request type

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

[cmonr]

/morph build

[mbed-ci]

Build : SUCCESS

Build number : 3305
Build artifacts/logs : http://mbed-os.s3-website-eu-west-1.amazonaws.com/?prefix=builds/8356/

Triggering tests

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

[mbed-ci]

Exporter Build : SUCCESS

Build number : 2940
Build artifacts/logs : http://mbed-os.s3-website-eu-west-1.amazonaws.com/?prefix=builds/exporter/8356/

[mbed-ci]

Test : SUCCESS

Build number : 3114
Test logs :http://mbed-os-logs.s3-website-us-west-1.amazonaws.com/?prefix=logs/8356/3114

[cmonr]

Closing since with #8387, the experiment has been a success!