arm-bsp/corstone500: removal of support

corstone500 is End-of-life'd (EOL'ed).  Remove support for it from the
tree.

Signed-off-by: Jon Mason <jon.mason@arm.com>

ci/corstone500.yml

@@ -1,12 +0,0 @@
-header:
-  version: 14
-  includes:
-    - ci/base.yml
-    - ci/fvp.yml
-    - ci/poky-tiny.yml
-
-local_conf_header:
-  fvp-config: |
-    IMAGE_FEATURES:remove = " ssh-server-dropbear"
-
-machine: corstone500

ci/fvps.yml

@@ -15,7 +15,6 @@ local_conf_header:
 
 target:
   - nativesdk-fvp-base-a-aem
-  - nativesdk-fvp-corstone500
   - nativesdk-fvp-corstone1000
   - nativesdk-fvp-n1-edge
   - nativesdk-fvp-sgi575

ci/jobs-to-kas

@@ -3,7 +3,7 @@
 # This script is expecting an input of machine name, optionally followed by a
 # colon and a list of one or more parameters separated by commas between
 # brackets.  For example, the following are acceptable:
-# corstone500
+# corstone1000-mps3
 # fvp-base: [testimage]
 # qemuarm64-secureboot: [clang, glibc, testimage]
 #