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

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",
+    ],
+}

minijail/Android.mk

@@ -1,14 +0,0 @@
-LOCAL_PATH := $(call my-dir)
-
-include $(CLEAR_VARS)
-LOCAL_MODULE := libhwminijail
-LOCAL_PROPRIETARY_MODULE := true
-LOCAL_EXPORT_C_INCLUDE_DIRS := $(LOCAL_PATH)/include
-LOCAL_C_INCLUDES := $(LOCAL_PATH)/include
-LOCAL_SRC_FILES := HardwareMinijail.cpp
-
-LOCAL_SHARED_LIBRARIES := \
-    libbase \
-    libminijail_vendor
-
-include $(BUILD_SHARED_LIBRARY)