Remove deprecated CIRCT Options (#3101)

* Make read-write inference on by default

Change CIRCT to turn on read-write inference by default.  This is
primarily done because this option was removed in:

  https://github.com/llvm/circt/commit/9620d656f8a59998cc38472a60f83bfdcb6a8549



Signed-off-by: Schuyler Eldridge <schuyler.eldridge@sifive.com>

* Remove IMCP disable option for CIRCT

Remove the ability to disable inter-module constant propagation (IMCP) when
running with CIRCT.  This option was removed in:

  https://github.com/llvm/circt/commit/9620d656f8a59998cc38472a60f83bfdcb6a8549



Signed-off-by: Schuyler Eldridge <schuyler.eldridge@sifive.com>

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Signed-off-by: Schuyler Eldridge <schuyler.eldridge@sifive.com>