[patch,avr] Fir PR91910: ICE for bad attribute "address".

[Georg-Johann Lay]

"address" attribute only must be specified with VARs,
yet the compiler dived into attribute analysis for
non-VARs, resulting in ICE.

This patch also adds OPT_Wattributes as warning filter.

Ok to apply?

Johann

gcc/
	PR target/81910
	* config/avr/avr.c (avr_handle_addr_attribute): Early return if
	not VAR_P. Filter attribute warnings with OPT_Wattributes.
	(avr_attribute_table) <io, io_low, address>: Initialize
	.decl_required with true.
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