Add require_root to binderSafeInterfaceTest and binderLibTest

After aosp/1120806 is landed, all gtest without require_root set to true
will default to have adb unroot on the device.

Bug: 140123924
Test: atest
Change-Id: Ie59bb9e04ffbf6827dfcd832713db8b2cff50528
diff --git a/libs/binder/tests/Android.bp b/libs/binder/tests/Android.bp
index bc457ce..f25e954 100644
--- a/libs/binder/tests/Android.bp
+++ b/libs/binder/tests/Android.bp
@@ -70,6 +70,7 @@
         "libutils",
     ],
     test_suites: ["device-tests"],
+    require_root: true,
 }
 
 cc_test {
@@ -136,6 +137,7 @@
         "libutils",
     ],
     test_suites: ["device-tests"],
+    require_root: true,
 }
 
 aidl_interface {