[Xtensa] add GAS default relax state

[Bob Wilson]

I've committed this patch from Sterling Augustine to avoid confusion when 
debugging GAS for Xtensa.  For frags that are not machine-dependent, the 
relaxation state field is not used, but the default value of zero mapped to an 
enum value that is used in other contexts.  The patch adds a new default state 
value to avoid confusion.

2008-03-03  Sterling Augustine  <sterling@tensilica.com>
	
	* config/tc-xtensa.h (RELAX_XTENSA_NONE): New.
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