MLBEDSW-4993: TFLite mapping error for Wav2Letter

Previous to this commit some networks were failing due
one or more options in the TFLite mapping being
incorrect after the update to match TF 2.5.
This commit reverts those changes.

Signed-off-by: Dwight Lidman <dwight.lidman@arm.com>
Change-Id: Ia0b577ca44d76486fc3e0ea9780e0dc1d2baf65e