Add hw multiplier to touchevent propagation time

There are lots of recent failures due to this timeout, see the dupes of
b/397654370. This is an speculative fix to prevent test flakiness.

Test: presubmit
Bug: 397654370
Flag: EXEMPT TEST_ONLY
Change-Id: Icd2c5d92c43f71b362c2748bac9a813341f736ba