MIPS: R6: Constify r2_decoder_tables

MIPS: R6: Constify r2_decoder_tables

The r2_decoder_tables are never modified. They are arrays of constant
values and as such should be declared const.

This change saves 256 bytes of kernel text, and 128 bytes of kernel data
(384 bytes total) on a 32r6el_defconfig (with SMP disabled)
Before:
   text	   data	    bss	    dec	    hex	filename
5576221	1080804	 267040	6924065	 69a721	vmlinux
After:
   text	   data	    bss	    dec	    hex	filename
5575965	1080676	 267040	6923681	 69a5a1	vmlinux

Signed-off-by: Matt Redfearn <matt.redfearn@imgtec.com>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/15289/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>