osmo-pcu[master]: Use built-in bit counter

[Max]

Patch Set 2: Code-Review-1

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Gerrit-MessageType: comment
Gerrit-Change-Id: Iaf470e9a7ee0d003177c4328f93849606ca31521
Gerrit-PatchSet: 2
Gerrit-Project: osmo-pcu
Gerrit-Branch: master
Gerrit-Owner: Max <msur...@sysmocom.de>
Gerrit-Reviewer: Jenkins Builder
Gerrit-Reviewer: Max <msur...@sysmocom.de>
Gerrit-Reviewer: Pau Espin Pedrol <pes...@sysmocom.de>
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