[inductor] Remove flag of bmm's dim m and n in shape padding (#90937)
Summary: There was an OOM issue in two internal models when turning on padding bmm with dim m and n with shape padding optimization, so added a flag to turned on/off for the internal models. The issue was gone now so removing the flag.
Differential Revision: D42074557
Pull Request resolved: https://github.com/pytorch/pytorch/pull/90937
Approved by: https://github.com/ngimel
