[patch,avr] Fix avr build broken by r276985.

[Georg-Johann Lay]

Hi,

r276985 broke avr because it removed PARAM_ALLOW_STORE_DATA_RACES from 
--params.  The patch fixes that by using flag_store_data_races = 1 instead.

Ok to apply?

Johann

	* config/avr/avr.c (avr_option_override): Fix broken build
	introduced by r276985.
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