staging: octeon: convert cvmx_pko_status_t from typedef to plain enum

staging: octeon: convert cvmx_pko_status_t from typedef to plain enum

The Linux kernel coding style discourages the use of typedefs for
enums. Convert cvmx_pko_status_t to a plain 'enum cvmx_pko_status' and
update all users across the MIPS Octeon architecture code and the
staging driver stubs.

No functional change.

Signed-off-by: Eric Wu <kunjinkao.jp@gmail.com>
Link: https://patch.msgid.link/20260427155427.668540-6-kunjinkao.jp@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>