MIPS: Octeon: Move cvmx_fuse_read_byte()

Move cvmx_fuse_read_byte() into a .c file.

Signed-off-by: Aaro Koskinen <aaro.koskinen@nsn.com>
Cc: David Daney <david.daney@cavium.com>
Cc: linux-mips@linux-mips.org
Cc: Aaro Koskinen <aaro.koskinen@nsn.com>
Patchwork: https://patchwork.linux-mips.org/patch/7666/


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