(This is a merge of http://go/wvgerrit/73743)
The CE CDM implements the ability to silence all logging with a "silent"
log level. However, under the covers, this assigned a value to g_cutoff
that was not a member of LogPriority, which fails some extremely strict
checks. This patch just adds a matching entry to LogPriority so that
"silent" is now a valid level in that enum.
Bug: 118622359
Test: CE CDM Build
Test: Android Build
Change-Id: Idafb26b7c5f9a24a32c84da9b3c5595434ef07fe
9a40a107f8