Clean up fused modules

[casper-hansen]

Fused modules were moved from the original TinyChat into the core of AWQ. Work on generalizing the code better with the parameters in the fused modules.

A few things that need cleaning:

https://github.com/casper-hansen/AutoAWQ/blob/main/awq/modules/fused_attn.py#L12
https://github.com/casper-hansen/AutoAWQ/blob/main/awq/modules/fused_attn.py#L107
https://github.com/casper-hansen/AutoAWQ/blob/main/awq/modules/fused_attn.py#L139
https://github.com/casper-hansen/AutoAWQ/blob/main/awq/modules/fused_mlp.py#L79C8-L79C31
https://github.com/casper-hansen/AutoAWQ/blob/main/awq/modules/fused_norm.py#L27

Additionally, move the code for isinstance(m, LlamaMLP) into the actual model class instead.

[casper-hansen]

#18 solved this cleanup