Reverting PinNames.h after PR #7774 changes

[yossi2le]

Description

In PR #7774 we have changed PinNames.h for various targets. Unfortunately, this was a mistake and those changes should not be done by us. Therefore this PR initiate a revert for those file.
We will open a discussion with the relevant stakeholders to enable this change in the future.

Pull request type

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

[0xc0170]

cc @ARMmbed/team-nuvoton @ARMmbed/team-silabs @ARMmbed/team-st-mcd @ARMmbed/team-nxp @ARMmbed/team-realtek

[cmonr]

@jeromecoutant Good with this revert?

Due to the time constraints of when this needs to get into RC2, we only have about 24 hrs to get an OK from partners.

[0xc0170]

/morph build

[davidsaada]

Looks good.

[mbed-ci]

Build : SUCCESS

Build number : 3021
Build artifacts/logs : http://mbed-os.s3-website-eu-west-1.amazonaws.com/?prefix=builds/7995/

Triggering tests

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

[mbed-ci]

Test : SUCCESS

Build number : 2788
Test logs :http://mbed-os-logs.s3-website-us-west-1.amazonaws.com/?prefix=logs/7995/2788

[mbed-ci]

Exporter Build : SUCCESS

Build number : 2636
Build artifacts/logs : http://mbed-os.s3-website-eu-west-1.amazonaws.com/?prefix=builds/exporter/7995/

[jeromecoutant]

Hi

#7774 added SPI_PERSISTENT_MEM_CS in 31 targets
This PR removed it from 28 targets...

Why did you keep 3 of them ?

[cmonr]

@yossi2le @ARMmbed/mbed-os-storage Thoughts to the above question?

[yossi2le]

We revert the PinNames.h files after #7774 because we haven't communicated it so well with all the relevant partners and teams. After #7774 was merged there was some discussion regarding this change and AFAIK it was decided that we leave K82F and K64F boards as an example, while we start the correct procedure of adding those pins into the PinsNames.h. This procedure should be done by conducting a proper dialogue with all the relevant partners and teams.