staging: octeon: remove typedef declaration for cvmx_fau_reg_32

Remove typedef declaration for enum cvmx_fau_reg_32.
Also replace its previous uses with new declaration format.
Issue found by checkpatch.pl

Signed-off-by: Wambui Karuga <wambui.karugax@gmail.com>
Acked-by: Julia Lawall <julia.lawall@lip6.fr>
Link: https://lore.kernel.org/r/b7216f423d8e06b2ed7ac2df643a9215cd95be32.1570821661.git.wambui.karugax@gmail.com


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>