Conformer WARs for TRT8.2

[borisfom]

Signed-off-by: Boris Fomitchev [email protected]

What does this PR do ?

With those changes, exported Conformer with autocast can be converted to TRT with TRT 8.2 (e.g. current nemo2riva).
Also, rolled back previous change of expand->repeat as expand yields better performance.

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[titu1994]

Lgtm

[VahidooX]

LGTM for now. But let's just revert it back when new TRT is released with the bug fix.