Removed TRNG peripheral from GR_LECHEE target

[cmonr]

Description

A continuation of the following PR: #5857

Disabling TRNG for the GR_LYCHEE board until @hanno-arm comments are addressed in a separate PR.

Status

READY

[cmonr]

For reference: @hanno-arm @TomoYamanaka

[cmonr]

/morph build

[mbed-ci]

Build : SUCCESS

Build number : 1006
Build artifacts/logs : http://mbed-os.s3-website-eu-west-1.amazonaws.com/?prefix=builds/5967/

Triggering tests

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

[mbed-ci]

Exporter Build : SUCCESS

Build number : 697
Build artifacts/logs : http://mbed-os.s3-website-eu-west-1.amazonaws.com/?prefix=builds/exporter/5967/

[0xc0170]

It would be helpful to provide a reason for this disabling in the commit message (why are we disabling it, reference a review/comment that needs to be addressed to have it enabled back)

[mbed-ci]

Test : FAILURE

Build number : 820
Test logs :http://mbed-os-logs.s3-website-us-west-1.amazonaws.com/?prefix=logs/5967/820

[studavekar]

Test : FAILURE
Build number : 820
Test logs :http://mbed-os-logs.s3-website-us-west-1.amazonaws.com/?prefix=logs/5967/820

Above failure is not related to PR, re-triggering the tests

/morph test

[cmonr]

Since #5970 came up much quicker than anticipated, I've marked this PR as Do Not Merge for now. If for some reason that PR is not ready for 5.7.5, I'll unblock this PR and get it into 5.7.5.

@0xc0170 Will do, if this gets merged.

[cmonr]

Testing a separate issue.
/morph build

[mbed-ci]

Build : ABORTED

Build number : 1016
Build artifacts/logs : http://mbed-os.s3-website-eu-west-1.amazonaws.com/?prefix=builds/5967/

[0xc0170]

Closing as the correct fix is going to be integrated instead