Revert "MIPS: microMIPS: Support dynamic ASID sizing."

This reverts commit f6b06d93.

The next revert depends on this one, so this has to go too.

Signed-off-by: David Daney <david.daney@cavium.com>
Cc: linux-mips@linux-mips.org
Cc: linux-kernel@vger.kernel.org
Cc: "Steven J. Hill" <Steven.Hill@imgtec.com>
Cc: David Daney <david.daney@cavium.com>
Patchwork: https://patchwork.linux-mips.org/patch/5241/


Signed-off-by: Ralf Baechle <ralf@linux-mips.org>