linuxptp: Do not install phc_ctl again

Main recipe is installing this in ${sbindir} so it should be used from
that location, this install was not doing intended thing here, the
phc_ctl binary gets installed as `bin` the correct syntax should have
been install -p ${S}/phc_ctl  ${D}/${bindir}/phc_ctl. Anyway since its
not longer needed, its better to delete it.

Fixes
ERROR: QA Issue: linuxptp: Files/directories were installed but not shipped in any package:
  /usr/bin
Please set FILES such that these items are packaged. Alternatively if they are unneeded, avoid installing them or delete them within do_install

Signed-off-by: Khem Raj <raj.khem@gmail.com>

Author: kraj