Qi Feng authored Nov 01, 2022 and Robbie Cao committed Nov 16, 2022

Introduce the meta-zephyr layer into v8r64 stack and switch to use it to
build Zephyr applications.

The main changes are as follows:
* Introduce meta-zephyr layer in the Kas config.
* Remove zephyr-base.inc, openamp.inc and the zephyr-toolchain-native
  recipe, the functionalities or settings they implement are provided in
  meta-zephyr.
* Move all those fvp-baser-aemv8r64 specific settings into
  zephyr-fvp-baser-aemv8r64.inc (for baremetal-zephyr) and
  zephyr-fvp-baser-aemv8r64-xen.inc (for virtualization)
* Reuse the recipes in meta-zephyr to build zephyr-helloworld,
  zephyr-synchronization and zephyr-philosophers applications.
  And remove those recipes with the same name in the
  meta-armv8r64-extras layer.
* Add zephyr-philosophers.bbappend to append extra customized settings.
* Rename meta-armv8r64-extras/lib/oeqa/runtime/cases/zephyr.py to avoid
  duplication to the zephyr test case in meta-zephyr.
* Add new directory zephyrcore to BBFILES_DYNAMIC to avoid some
  .bbappend files' hard dependencies.

Signed-off-by: Robbie Cao <robbie.cao@arm.com>
Signed-off-by: Qi Feng <qi.feng@arm.com>
Issue-Id: SCM-5228
Change-Id: Iacbe4daef541a5f4d1000aaac486e26bf29d1beb