Do not run mapLockTest on 4.9 kernels

bpfLock() does nothing on 4.9 as it relies on bpfGetFdMapId which is not available until 4.14.

Change-Id: Ib737db61a5d8fb39bcbbe1bb5937afb0c63bd1d1
Test: TH
Bug: 349034378
1 file changed