minor fixes for Xtensa HOWTOs

[Bob Wilson]

Some of the fields in the Xtensa HOWTO structures were incorrect.  I don't think 
any of these really matter, at least for the code that is normally used by the 
assembler and linker, but I'd like them to be correct anyway.  The patch also 
adds a comment or two and reformats the entries to make them more concise. 
Tested with an xtensa-elf build and committed.

bfd/
	* elf32-xtensa.c (elf_howto_table) <R_XTENSA_GLOB_DAT>
	<R_XTENSA_JMP_SLOT, R_XTENSA_RELATIVE, R_XTENSA_PLT, R_XTENSA_DIFF32>:
	Set src_mask to zero.
	<R_XTENSA_DIFF8, R_XTENSA_DIFF16>: Likewise.  Also fix dst_mask.
	<R_XTENSA_ASM_EXPAND>: Set pcrel_offset to TRUE.

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