Async reset tieoff bug (bp #1854) (#1861)

* Async reset tieoff bug (#1854)

* Elide emission of literals  for async reset in sensitivity lists

* Deprecate LegalizeClocksTransform

Co-authored-by: mergify[bot] <37929162+mergify[bot]@users.noreply.github.com>
(cherry picked from commit 72d3983b

)

# Conflicts:
#	src/main/scala/firrtl/transforms/LegalizeClocksAndAsyncResets.scala
#	src/test/scala/firrtlTests/AsyncResetSpec.scala
#	src/test/scala/firrtlTests/transforms/LegalizeClocks.scala

* Resolve merge conflicts for BP PR#1861

Co-authored-by: David Biancolin <biancolin@eecs.berkeley.edu>
Co-authored-by: David Biancolin <david.biancolin@gmail.com>