LSTM: require input layer norm weights to be omitted in case CIFG is used.

In case of CIFG LSTM, input layer norm weights are not used in the
computation.

Bug: 129126572
Test: mma
Change-Id: I57bc578606132a2c44c71ab63dd7645dcc001302
Merged-In: I57bc578606132a2c44c71ab63dd7645dcc001302
(cherry picked from commit 0480af9aa84beba07061cfc5279ad6cc9a75af4c)
2 files changed