opcodes: blackfin: decode all ASTAT bits

opcodes: blackfin: decode all ASTAT bits

All ASTAT bits work in the hardware even though they aren't part of the
official Blackfin ISA.  So decode every ASTAT field to make the output
a bit nicer when working with hand generated opcodes.

Signed-off-by: Mike Frysinger <vapier@gentoo.org>