MLBEDSW-5417: Update release notes & supported ops

This commit updates the release notes for Vela
version 3.2.0.
It also updates the SUPPORTED_OPS.md file with new
constraints.
Updated the API version as a result of the bug fix
commit 399c4a2d.
Updated Vela version in setup.py.

Signed-off-by: Dwight Lidman <dwight.lidman@arm.com>
Change-Id: I181e89f639a1da6013e8511ebe2d7e4f81242916