Add <sched.h> unit tests for cpu_set_t

This adds test_cpu_set to check the new features provided by
<sched.h> around cpu_set_t (i.e. CPU_SETSIZE, CPU_ZERO, CPU_SET,
sched_getaffinity, sched_setaffinity, sched_getcpu, ...)

Change-Id: I59030badb6f6c7560f7cb48fcfa722e8d7b9b1b9
2 files changed