Convert to Android.bp; rename libminijail_vendor

libminijail_vendor is now just libminijail, now that it's been converted
to Soong.

See build/soong/README.md for more information about Soong.

Test: mmma hardware/interfaces/minijail
Change-Id: Iefa49fbbd96c1ae18c5da4367e2c9135d8c25a5c
diff --git a/minijail/Android.bp b/minijail/Android.bp
new file mode 100644
index 0000000..b95f029
--- /dev/null
+++ b/minijail/Android.bp
@@ -0,0 +1,12 @@
+cc_library_shared {
+    name: "libhwminijail",
+    vendor: true,
+    export_include_dirs: ["include"],
+
+    srcs: ["HardwareMinijail.cpp"],
+
+    shared_libs: [
+        "libbase",
+        "libminijail",
+    ],
+}