Add octa RAM calibration feature to GR-MANGO.

[RyoheiHagimoto]

Added octa RAM calibration feature to GR-MANGO.
Modified files in the sub-directory of targets/TARGET_RENESAS/TARGET_RZ_A2XX/.

Summary of changes

Added Octa RAM calibration feature to GR-MANGO.

Impact of changes

Affects GR-MANGO only.

Migration actions required

Documentation

Ported Octa RAM calibration from RZ/A2M Software Package for GR-MANGO.
https://www.renesas.com/software-tool/rza2m-freertos-software-package#grmango

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Pull request type

[x] Patch update (Bug fix / Target update / Docs update / Test update / Refactor)
[] Feature update (New feature / Functionality change / New API)
[] Major update (Breaking change E.g. Return code change / API behaviour change)

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Test results

[] No Tests required for this change (E.g docs only update)
[x] Covered by existing mbed-os tests (Greentea or Unittest)
[] Tests / results supplied as part of this PR

Following file is the log of GreenTea:
greentea_grmango_20201203.zip

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Reviewers

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[ciarmcom]

@RyoheiHagimoto, thank you for your changes.
@ARMmbed/team-renesas-rz @ARMmbed/mbed-os-maintainers please review.

[0xc0170]

Can you fix the license, this is not any permissive license we know (it was similar in the recent PRs and it was relicensed as I recall).

Pull request has been modified.

[0xc0170]

CI started

[mbed-ci]

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jenkins-ci/mbed-os-ci_unittests	✔️
jenkins-ci/mbed-os-ci_cmake-example-GCC_ARM	✔️
jenkins-ci/mbed-os-ci_cmake-example-ARM	✔️
jenkins-ci/mbed-os-ci_build-cloud-example-ARM	✔️
jenkins-ci/mbed-os-ci_build-greentea-ARM	✔️
jenkins-ci/mbed-os-ci_build-cloud-example-GCC_ARM	✔️
jenkins-ci/mbed-os-ci_build-example-ARM	✔️
jenkins-ci/mbed-os-ci_build-example-GCC_ARM	✔️
jenkins-ci/mbed-os-ci_build-greentea-GCC_ARM	✔️
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jenkins-ci/mbed-os-ci_cmake-example-test	✔️
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