ARMC6: legacy align error

[0xc0170]

Description

This PR removed legacy align : #7792 . It produces warning. This removed warning but causing now failures to use scatter files we have in the code base as they rely on the alignment that is now legacy. This leads to linker errors (4 vs 8 byte alignment). I could not find documentation why this alignment was deprecated but causing "breaking change" in this case as we would need to update all scatter files to use a new alignment.

@deepikabhavnani @JanneKiiskila

Issue request type

[ ] Question
[ ] Enhancement
[X] Bug

[deepikabhavnani]

As per the http://infocenter.arm.com/help/index.jsp?topic=/com.arm.doc.dui0803g/pge1362075504330.html, --legacyalign, --no_legacyalign are deprecated, hence were removed from mbed-os.

We have two options to resolve the issue:

1. Fix the sections in scatter file to fix the alignment issue
2. Enabling deprecated option --legacyalign

I would prefer option 1.
[Mirrored to Jira]

[JanneKiiskila]

PR to fix this - #8012 - get things working ASAP, then do fix 2 once you have a test that actually verifies the targets. The scatter file changes are sort of trivial, BUT - there are so many of them that it's not a quick and easy fix to get them all sorted out.

[Mirrored to Jira]

[cmonr]

Going to keep this open for now even though #8012 has been merged.
If we want to remove the legacyalign flag, we should fix the files and figure out why the deperecated flag led to behavior changes.
[Mirrored to Jira]

[adbridge]

Internal Jira reference: https://jira.arm.com/browse/IOTCORE-415