MLBEDSW-10247: Fix non-8-bit transpose implementation
While Ethos-U55 does not support 32-bit transposing, it appears that a previous approach that treats everything as 8-bit quantities works for the most common transpose cases (NHWC, NHCW).
- Restore the treat-as-8-bit transpose path for Ethos-U55.
- Fixes bad slice address offsets when source tensor is unsliced.
Signed-off-by: Philip Hall philip.hall@arm.com Change-Id: I2e28db217c50ce37b34e5265402acef318fdb873