Undefined method `Serial.set_buffer_size` method for non windows environment

[Aran Moncusí Ramírez]

ltchiptool/ltchiptool/soc/ambz2/util/ambz2tool.py

Line 195 in 8dcb18a

 self.s.set_buffer_size(rx_size=min(32768, 57 * (count // 4))) 

This method only exist in the serialwin32.py implementation for SerialBase, then in different systems broke the current code.
Check the impl: https://github.com/pyserial/pyserial/blob/master/serial/serialwin32.py#L418

[Aran Moncusí Ramírez]

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