armv8r64-extras/openamp: Upgrade libmetal & open-amp to v2022.10

And also remove the .bbappend files as they are not needed now.

Issue-Id: SCM-4874
Signed-off-by: Robbie Cao <robbie.cao@arm.com>
Change-Id: I30d9f6a167d3a3206137b25e1aaa8f75be31b5f7