opcodes: Fix the auxiliary register numbers for ARC HS

The numbers for the auxiliary registers "tlbindex" and
"tlbcommand" of ARCv2HS are incorrect.  This patch makes
the following changes to correct that error.

 ,------------.-----------------.---------------.
 | aux. reg.  | old (incorrect) | new (correct) |
 |------------+-----------------+---------------|
 | tlbindex   |      0x463      |     0x464     |
 | tlbcommand |      0x464      |     0x465     |
 `------------^-----------------^---------------'

opcodes/
2021-08-17  Shahab Vahedi <shahab@synopsys.com>

	* arc-regs.h (DEF): Fix the register numbers.