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Support uint8 quantized rsqrt

Limin Tang requested to merge qrsqrt into main 
Support uint8 quantized rsqrt

Two changes:

1) Add support for uint8 quantized rsqrt using lut
2) TFLite doesn't support uint8 quantized rsqrt natively, it converts
the op into to [quantize, int8 rsqrt, quantize]. Add an optimizer pass
to convert it back to uint8 rsqrt.

Change-Id: I30b0c0ef314d89695fc3489098ea876b4df6ea09
Signed-off-by: Limin Tang <limintang@meta.com>
Edited by Limin Tang

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