logcatd: Do not su for setprop

(cherry pick from commit 8d2a65572b5aa3d7d3885bd1b46d7c1f22e052b6)

sepolicy now permits setting persist.logd.logpersistd in shell

Bug: 28788401
Bug: 28813587
Bug: 28936216
Change-Id: Ieed50eae0f91afa5b0c0e4ade7a71922c4b7ef93
1 file changed