selftests: binderfs skip when syscall unavailable

Change pass to skip when the binderfs syscall is not supported

Bug: 207175332
Bug: 208276189
Test: atest vts_linux_kselftest_arm_64:binderfs_arm_64#binderfs_arm_64
Change-Id: If28637c69c65b28bc68e6660f1df004efc436eb8
Signed-off-by: Edward Liaw <edliaw@google.com>
2 files changed