clock_getres: Migrate to utils_build

Tested by running: clock_getres

Signed-off-by: Jonas Eriksson <jonas.eriksson@enea.com>
tsc_sync tests: Migrate to utils_build

Remove dependency towards popt, as it is not used in the source code.
popt.h was probably included by mistake, as it is not mentioned as a
required linker flag (-lpopt) in the build instruction comment.

Tested by running:
- timerdevice.clock_drift_with_ntp
- timerdevice.tscsync.change_host_clksource
- timerdevice.tscsync.longtime

Signed-off-by: Jonas Eriksson <jonas.eriksson@enea.com>
clock_drift_with_ntp: Parameterize

Try to fetch the drift file name and ntp stop/start commands from the
configuration parameters, fall back to old values.

Signed-off-by: Jonas Eriksson <jonas.eriksson@enea.com>
cpuflags: Migrate to utils_build

Signed-off-by: Jonas Eriksson <jonas.eriksson@enea.com>