ifndef some macros to allow overriding during compilation

[aashishc1988]

ifndef some macros to allow overriding during compilation or be able to get some warnings during redefinition

To address: #6895

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

[OPpuolitaival]

I don't know where that effects really

[0xc0170]

/morph build

[mbed-ci]

Build : SUCCESS

Build number : 2850
Build artifacts/logs : http://mbed-os.s3-website-eu-west-1.amazonaws.com/?prefix=builds/7761/

Triggering tests

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

[mbed-ci]

Exporter Build : SUCCESS

Build number : 2481
Build artifacts/logs : http://mbed-os.s3-website-eu-west-1.amazonaws.com/?prefix=builds/exporter/7761/

[mbed-ci]

Test : FAILURE

Build number : 2609
Test logs :http://mbed-os-logs.s3-website-us-west-1.amazonaws.com/?prefix=logs/7761/2609

[0xc0170]

/morph test

[mbed-ci]

Test : FAILURE

Build number : 2623
Test logs :http://mbed-os-logs.s3-website-us-west-1.amazonaws.com/?prefix=logs/7761/2623

[0xc0170]

we will restart entire build (the build was aborted but only test job was requested ?)

[cmonr]

/morph build

[mbed-ci]

Build : SUCCESS

Build number : 2912
Build artifacts/logs : http://mbed-os.s3-website-eu-west-1.amazonaws.com/?prefix=builds/7761/

Triggering tests

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

[mbed-ci]

Exporter Build : SUCCESS

Build number : 2532
Build artifacts/logs : http://mbed-os.s3-website-eu-west-1.amazonaws.com/?prefix=builds/exporter/7761/

[mbed-ci]

Test : SUCCESS

Build number : 2662
Test logs :http://mbed-os-logs.s3-website-us-west-1.amazonaws.com/?prefix=logs/7761/2662

[0xc0170]

We will fix uvisor CI build