generalize Xtensa assembly operand suffixes

[Bob Wilson]

I'm getting ready to add some new Xtensa relocations for TLS.  This patch 
generalizes the code for handling relocation suffixes to enable that.  It 
doesn't yet introduce any functional changes.  Tested with an xtensa-elf build 
and committed.

gas/
	* config/tc-xtensa.c (SUFFIX_MAP, suffix_relocs): New.
	(xtensa_elf_suffix): Use suffix_relocs instead of local mapping table.
	(map_suffix_reloc_to_operator): New.
	(map_operator_to_reloc): New.
	(expression_maybe_register): Fix incorrect test of return value from
	xtensa_elf_suffix.  Rearrange to use map_suffix_reloc_to_operator.
	(xg_assemble_literal, convert_frag_immed): Use map_operator_to_reloc.

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