ltp: remove pselect01_64,clock_nanosleep02 from stable

pselect01_64 and clock_nanosleep02 tests are being disabled as they are flaky.

Test: run vts-kernel -m VtsKernelLtp
Bug: 76150357
Bug: 76447495
Link: http://android-vts.appspot.com/show_tree?testName=VtsKernelLtpStaging&endTime=1522056850820434&showPostsubmit=
Link: https://docs.google.com/spreadsheets/d/1bnZ9UPuZbtjKjYrGkUnFPihMijBTLF6VogWmOw2TjiE/edit?usp=sharing

Change-Id: I29995b3652786d10240838afebf7223abf67e941
1 file changed