minijail: Prefix unit test binaries to avoid confusion.

These unit test binaries will be listed alongside many others from
Android. Prefix them to avoid confusion.

Bug: 72386870
Test: make, check host and target output.
Change-Id: I56779fa468c43924604d3dc97e4b8534b4888508
diff --git a/Android.bp b/Android.bp
index 6fb7476..911e0fc 100644
--- a/Android.bp
+++ b/Android.bp
@@ -210,13 +210,13 @@
 // System functionality unit tests using gtest.
 //
 // For a device, run with:
-// adb shell /data/nativetest/system_unittest_gtest/system_unittest_gtest
+// adb shell /data/nativetest/mj_system_unittest_gtest/mj_system_unittest_gtest
 //
 // For host, run with:
-// out/host/linux-x86/nativetest(64)/system_unittest_gtest/system_unittest_gtest
+// out/host/linux-x86/nativetest(64)/mj_system_unittest_gtest/mj_system_unittest_gtest
 // =========================================================
 cc_test {
-    name: "system_unittest_gtest",
+    name: "mj_system_unittest_gtest",
     defaults: ["libminijail_flags"],
     host_supported: true,
 
@@ -239,13 +239,13 @@
 // Utility functionality unit tests using gtest.
 //
 // For a device, run with:
-// adb shell /data/nativetest/util_unittest_gtest/util_unittest_gtest
+// adb shell /data/nativetest/mj_util_unittest_gtest/mj_util_unittest_gtest
 //
 // For host, run with:
-// out/host/linux-x86/nativetest(64)/util_unittest_gtest/util_unittest_gtest
+// out/host/linux-x86/nativetest(64)/mj_util_unittest_gtest/mj_util_unittest_gtest
 // =========================================================
 cc_test {
-    name: "util_unittest_gtest",
+    name: "mj_util_unittest_gtest",
     defaults: ["libminijail_flags"],
     host_supported: true,