tms320: add XACS/XACD fields parsing for the x55x

It was surprising for me that these fields are not parsed properly. Found that
by crafting test cases in radare2-regressions.

Also, opcode table for the c55x was slighly incorrect. Hope, next patch will fix
that confusion.
tms320: fix c55x opcode table

This patch fixes c55x opcode table and solves the problem with parsing of 2 or
more similar instructions that differs in some bits. Mmatching algorithm doesn't
takes into account wildcard mask length.

It leads to bad situation where first instruction match may complete successfull
but the second instruction, which in turn has more presicely mask, doesn't be
looked up:

       INSN1 with mask AAAA xxxx BBBB	(matched by wildcard mask)
       INSN2 with mask AAAA CCCC BBBB

Here the 'xxxx' is a 4-bit whildcard mask, 'AAAA', 'BBBB' and 'CCCC' is 4-bit
values.

The solution is to rebuild tables sorting items by the wildcard mask length
ascending.
tms320: add c55x table generator script