MIPS/opcodes: Output thread context registers numerically with MFTR/MTTR

We print MFTR and MTTR instructions' thread context register operand in
disassembly using the ABI name the register number would correspond to
should the targeted register be a general-purpose register.

However in most cases it is wrong, because general-purpose registers are
only referred when the 'u' and 'sel' operands are 1 and 0 respectively.
And even in these cases the MFGPR and MTGPR aliases take precedence over
the corresponding generic instruction encodings, so you won't see the
valid case to normally trigger.

Conversely decoding the thread context register operand numerically is
always valid, so switch to using it.  Adjust test coverage accordingly.

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