Port IdentityCredential HAL to AIDL.

This includes add a partial types-only HAL for KeyMaster for
HardwareAuthToken.

Bug: 111446262
Test: atest android.security.identity.cts
Test: VtsHalIdentityTargetTest
Test: android.hardware.identity-support-lib-test
Change-Id: I7a6254d33200bfd62269aed1957cbb2a84b16272
diff --git a/keymaster/aidl/Android.bp b/keymaster/aidl/Android.bp
new file mode 100644
index 0000000..a2d73ead
--- /dev/null
+++ b/keymaster/aidl/Android.bp
@@ -0,0 +1,18 @@
+aidl_interface {
+    name: "android.hardware.keymaster",
+    vendor_available: true,
+    srcs: [
+        "android/hardware/keymaster/*.aidl",
+    ],
+    stability: "vintf",
+    backend: {
+        java: {
+            platform_apis: true,
+        },
+        ndk: {
+            vndk: {
+                enabled: true,
+            },
+        },
+    },
+}