Remove meta-arm-systemready

meta-arm-systemready was intended to allow people writing BSPs to run
the SystemReady Architecture Compliance Suite[1] within the Yocto build
environment. However, whilst this seems like a good idea, there are
several problems:

- This layer only supports the IR band and v2 of the ACS. The ACS is now
  at v3 and the bands altered, so there is no value in running obsolete
  tests.

- Execution of the tests takes a long time, we have integration to run
  the tests on a virtual fvp-base machine but execution takes many tens
  of hours (our CI times out after 12, on a high-performance worker).
  Running the tests in CI, and in particular inside BitBake, isn't
  obviously the right thing to do.

- Execution on the tests on real hardware is not trivial, as testimage
  has virtual targets as a primary usecase. It is unclear if anyone has
  managed to use this layer on physical hardware.

Because of these issues, remove the layer. There are better integration
points for automated ACS testing, and this integration is obsolete.

[1] https://github.com/ARM-software/arm-systemready

Signed-off-by: Ross Burton <ross.burton@arm.com>
Signed-off-by: Jon Mason <jon.mason@arm.com>

kas/arm-systemready-firmware.yml

@@ -1,12 +0,0 @@
-header:
-  version: 13
-
-repos:
-  meta-arm:
-    layers:
-      meta-arm-systemready:
-
-distro: nodistro
-
-target:
-  - arm-systemready-firmware

kas/arm-systemready-ir-acs.yml

@@ -1,12 +0,0 @@
-header:
-  version: 13
-  includes:
-    - kas/arm-systemready-firmware.yml
-
-env:
-  TESTIMAGE_AUTO: "1"
-  # The full testimage run typically takes around 12-24h on fvp-base.
-  TEST_OVERALL_TIMEOUT: "${@ 24*60*60}"
-
-target:
-  - arm-systemready-ir-acs

kas/arm-systemready-linux-distros-debian.yml

@@ -1,8 +0,0 @@
-header:
-  version: 13
-  includes:
-    - kas/arm-systemready-firmware.yml
-    - kas/arm-systemready-linux-distros-unattended-installation.yml
-
-target:
-  - arm-systemready-linux-distros-debian

kas/arm-systemready-linux-distros-fedora.yml

@@ -1,8 +0,0 @@
-header:
-  version: 16
-  includes:
-    - kas/arm-systemready-firmware.yml
-    - kas/arm-systemready-linux-distros-unattended-installation.yml
-
-target:
-  - arm-systemready-linux-distros-fedora

kas/arm-systemready-linux-distros-opensuse.yml

@@ -1,8 +0,0 @@
-header:
-  version: 13
-  includes:
-    - kas/arm-systemready-firmware.yml
-    - kas/arm-systemready-linux-distros-unattended-installation.yml
-
-target:
-  - arm-systemready-linux-distros-opensuse

kas/arm-systemready-linux-distros-unattended-installation.yml

@@ -1,11 +0,0 @@
-header:
-  version: 16
-
-env:
-  DISTRO_UNATTENDED_INST_TESTS:
-  # The full testimage run typically takes around 12-24h on fvp-base.
-  TEST_OVERALL_TIMEOUT: "${@ 24*60*60}"
-  
-local_conf_header:
-  systemready-unattended-inst: |
-    TESTIMAGE_AUTO = "${@oe.utils.vartrue("DISTRO_UNATTENDED_INST_TESTS", "1", "", d)}"