revert r302146: makeroot: zero out subsecond component of time= keywords

After r345281 by mhorne subsecond components are supported.

PR:		194703
Sponsored by:	The FreeBSD Foundation

tools/tools/makeroot/makeroot.sh

@@ -238,9 +238,5 @@ if [ -n "${SIZE}" ]; then
 SIZEFLAG="-s ${SIZE}"
 fi
 
-# Zero out subsecond component of time= keywords as they are currently not
-# supported by makefs
-sed -i '' -E 's/(time=[0-9]*)\.[0-9]*/\1.0/' ${manifest}
-
 cd ${BSDROOT}; makefs ${DUPFLAG} -N ${DBDIR} ${SIZEFLAG} ${BFLAG} \
      -t ffs ${LABELFLAG} -f 256 ${IMGFILE} ${manifest}