[quant][graphmode][fix] Remove assert for uses == 1 in remove dequantize pass (#41859)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/41859
A value can be used multiple times in the same node, we don't really need to assert uses of dequantize == 1
Test Plan: Imported from OSS
Reviewed By: raghuramank100
Differential Revision: D22673525
fbshipit-source-id: 2c4a770e0ddee722ca54e68d310c395e7f418b3b
