Use String8/16 c_str (mainline modules)

Bug: 295394788
Test: make checkbuild
Change-Id: Ia266bccfc9100da25d8605d93c1298a341d2b11a
diff --git a/media/module/service.mediatranscoding/tests/MediaTranscodingServiceTestHelper.h b/media/module/service.mediatranscoding/tests/MediaTranscodingServiceTestHelper.h
index 8e17f55..723bd77 100644
--- a/media/module/service.mediatranscoding/tests/MediaTranscodingServiceTestHelper.h
+++ b/media/module/service.mediatranscoding/tests/MediaTranscodingServiceTestHelper.h
@@ -76,7 +76,7 @@
     PermissionController pc;
     uid = pc.getPackageUid(packageName, 0);
     if (uid <= 0) {
-        ALOGE("Unknown package: '%s'", String8(packageName).string());
+        ALOGE("Unknown package: '%s'", String8(packageName).c_str());
         return BAD_VALUE;
     }