Make sys_ptrace_test.cpp Yama LSM-aware

This change enables the tracer process to be able to call ptrace(2) on
the worker process, which is does not have a direct-ancestor dependency.

Bug: 77146512
Test: adb shell \
      /data/nativetest{,64}/bionic-unit-tests{,-static}/bionic-unit-tests-{,-static} \
      --gtest_filter='spawn*'  # aosp_sailfish and Chrome OS
Test: cts-tradefed run singleCommand cts --skip-preconditions \
      -m CtsBionicTestCases --test 'PtraceResumptionTest*'  # aosp_sailfish
                                                            # and Chrome OS
Change-Id: I9e41b3ddde64c0623ba9299cede9d5b2001c8e30