Fix PR5578

[SeppoTakalo]

Fix #5578 by including the header file that introduces MBED_STATIC_ASSERT macro.

[SeppoTakalo]

@0xc0170 This has to be considered as a high priority fix because it blocks some of our test builds (see #5578 ). Please test&merge promptly.

[0xc0170]

/morph build

[0xc0170]

👍

All CI are triggered

[mbed-ci]

Build : SUCCESS

Build number : 735
Build artifacts/logs : http://mbed-os.s3-website-eu-west-1.amazonaws.com/?prefix=builds/5748/

Triggering tests

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

[0xc0170]

@orenc17A Please review the failure

[orenc17]

@0xc0170 Fixed

[mbed-ci]

Exporter Build : SUCCESS

Build number : 390
Build artifacts/logs : http://mbed-os.s3-website-eu-west-1.amazonaws.com/?prefix=builds/exporter/5748/

[mbed-ci]

Test : SUCCESS

Build number : 564
Test logs :http://mbed-os-logs.s3-website-us-west-1.amazonaws.com/?prefix=logs/5748/564