Reland Add microdroid_16k

So far only non-protected VMs can boot with 16k kernel.

Support for microdroid_16k pvms is tracked in b/376870129.

Bug: 317201718
Bug: 376517173
Bug: 333730505
Bug: 376870129
Test: adb shell /apex/com.android.virt/bin/vm run-microdroid \
    --os microdroid_16k \
    --debug full
Test: atest MicrodropidTests
Test: atest MicrodroidHostTestCases
Test: atest virtualizationmanager_device_test
Test: presubmit
Change-Id: I0fe5cd431b16f57e5bcc51146691fd0368d30818
diff --git a/build/microdroid/microdroid_16k.json b/build/microdroid/microdroid_16k.json
new file mode 100644
index 0000000..ba6a949
--- /dev/null
+++ b/build/microdroid/microdroid_16k.json
@@ -0,0 +1,21 @@
+{
+  "kernel": "/apex/com.android.virt/etc/fs/microdroid_kernel_16k",
+  "disks": [
+    {
+      "partitions": [
+        {
+          "label": "vbmeta_a",
+          "path": "/apex/com.android.virt/etc/fs/microdroid_vbmeta.img"
+        },
+        {
+          "label": "super",
+          "path": "/apex/com.android.virt/etc/fs/microdroid_super.img"
+        }
+      ],
+      "writable": false
+    }
+  ],
+  "memory_mib": 256,
+  "console_input_device": "hvc0",
+  "platform_version": "~1.0"
+}