logd: klogd: sniff for time correction on Mediatek

Need some more flexibility when parsing kernel messages
cluttered with extra fluff. This is the minimal relaxation
we can do to the rules to ensure that we work on all
possible devices and kernels when sniffing for time
correction information.

We want to minimize any future maintenance, keep in mind
klogd is a "userdebug" or "eng" feature and is disabled
in "user" builds. Manage expectations.

Bug: 23517551
Change-Id: I026d074e14fb2550e728683e85a973bd87e78a9c