ff_lpc546xx: add enet, change led1 and led3 pins

[gorazdko]

This PR adds ethernet support for FF_LPC546XX by reusing code from LPC546XX

results.txt

status: ready

Edit

I also added commit to change led1 and led3 pins due to #5632. We will now send a couple of boards for CI

cc:
@screamerbg
@ashok-rao

Edit 2:

pin26 changed

[gorazdko]

cc: @mmahadevan108

[0xc0170]

@gorazdko What is the status, I can see the recent change.

[gorazdko]

Its ready.
We changed p26. Will send new boards for this.

[0xc0170]

Can you please rebase to resolve travis timeout (fix is on master) ?

[mbed-ci]

Automatic CI verification build not done, please verify manually.

[gorazdko]

rebased

[0xc0170]

/morph build

[mbed-ci]

Build : SUCCESS

Build number : 788
Build artifacts/logs : http://mbed-os.s3-website-eu-west-1.amazonaws.com/?prefix=builds/5651/

Triggering tests

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

[mbed-ci]

Exporter Build : SUCCESS

Build number : 442
Build artifacts/logs : http://mbed-os.s3-website-eu-west-1.amazonaws.com/?prefix=builds/exporter/5651/

[mbed-ci]

Test : FAILURE

Build number : 623
Test logs :http://mbed-os-logs.s3-website-us-west-1.amazonaws.com/?prefix=logs/5651/623

[cmonr]

/morph test

Testing a theory.

[mbed-ci]

Test : FAILURE

Build number : 634
Test logs :http://mbed-os-logs.s3-website-us-west-1.amazonaws.com/?prefix=logs/5651/634

[0xc0170]

The last test did not run, restarting

/morph test

[mbed-ci]

Test : SUCCESS

Build number : 643
Test logs :http://mbed-os-logs.s3-website-us-west-1.amazonaws.com/?prefix=logs/5651/643