arm-bsp:corstone1000: Create a standalone corstone1000-a320-fvp machine

Add `corstone1000-a320-fvp` as a dedicated machine instead of enabling
the Cortex-A320 variant through a kas overlay on `corstone1000-fvp`.

Move the A320-specific machine features, overrides, FVP executable
selection, and Ethos-U85 configuration into the new machine
configuration. Keep the generic `corstone1000-fvp` machine focused on
the base FVP platform.

Update the A320 kas to use `corstone1000-a320-fvp` directly, and
allow pregenerated SSH host keys for the new virtual machine.

Signed-off-by: Alex Chapman <alex.chapman@arm.com>
Signed-off-by: Hugues KAMBA MPIANA <hugues.kambampiana@arm.com>
Signed-off-by: Jon Mason <jon.mason@arm.com>

kas/corstone1000-a320-fvp.yml

@@ -0,0 +1,22 @@
+header:
+  version: 14
+  includes:
+    - kas/corstone1000-base.yml
+    - kas/corstone1000-image-configuration.yml
+    - kas/corstone1000-firmware-only.yml
+    - kas/fvp-eula.yml
+
+env:
+  DISPLAY:
+  WAYLAND_DISPLAY:
+  XAUTHORITY:
+
+local_conf_header:
+  testimagefvp: |
+    IMAGE_CLASSES += "fvpboot"
+
+  mass-storage: |
+    # Ensure the Mass Storage device is absent
+    FVP_CONFIG[board.msd_mmc.p_mmc_file] = "invalid.dat"
+
+machine: corstone1000-a320-fvp

kas/corstone1000-a320.yml

@@ -1,9 +0,0 @@
-# yaml-language-server: $schema=https://raw.githubusercontent.com/siemens/kas/master/kas/schema-kas.json
-
-header:
-  version: 14
-
-local_conf_header:
-  a320: |
-    MACHINE_FEATURES += "cortexa320"
-    OVERRIDES .= ":cortexa320"