Add require_root for libcutils tests

7 of these tests require root

Test: these tests pass as root
Change-Id: Ife4d1ae0c8fe8a2ace288c584ac044a37bae0b3e

libcutils/Android.bp

@@ -244,6 +244,7 @@ cc_test {
     defaults: ["libcutils_test_default"],
     host_supported: true,
     shared_libs: test_libraries,
+    require_root: true,
 }
 
 cc_test {
@@ -255,6 +256,7 @@ cc_test {
         "libcgrouprc_format",
     ] + test_libraries,
     stl: "libc++_static",
+    require_root: true,
 
     target: {
         android: {