Platform: Improve mbed_sleep.h

[pan-]

Description

• Qualify inclusion of sleep_api.h
• use standard inline qualification instead of the non standard __INLINE

Pull request type

• Refactor

[pan-]

@0xc0170 Could you review this change ?

[0xc0170]

/morph build

[mbed-ci]

Build : SUCCESS

Build number : 1257
Build artifacts/logs : http://mbed-os.s3-website-eu-west-1.amazonaws.com/?prefix=builds/6209/

Triggering tests

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

[mbed-ci]

Exporter Build : FAILURE

Build number : 921
Build artifacts/logs : http://mbed-os.s3-website-eu-west-1.amazonaws.com/?prefix=builds/exporter/6209/

[mbed-ci]

Test : SUCCESS

Build number : 1054
Test logs :http://mbed-os-logs.s3-website-us-west-1.amazonaws.com/?prefix=logs/6209/1054

[cmonr]

/morph export-build

[mbed-ci]

Exporter Build : SUCCESS

Build number : 935
Build artifacts/logs : http://mbed-os.s3-website-eu-west-1.amazonaws.com/?prefix=builds/exporter/6209/

[pan-]

@0xc0170 Looks like a CI issue. Could you relaunch the tests ?

[cmonr]

@pan- Will relaunch pr-head once the CI is stable again. Something has been affecting them for the past hour or two.