With recently merged kernel change pa/1916082, down rate limit will be
adjusted dynamically. Without out this change, we would run into cases
that we too little down rate limit for little.
Bug: 186392111
Bug: 170511089
Test: boot and check rate limit
Signed-off-by: Wei Wang <wvw@google.com>
Change-Id: I78d9894301c9f4f888d33010c9fcca20d51d4b20