Remove NETLOGIC_ prefix from gpio register definitions, this will
bring it in-line with the other Netlogic headers.

Having NETLOGIC prefix here is misleading because these are XLR/XLS
specific register definitions.
Signed-off-by: Jayachandran C <jayachandranc@netlogicmicro.com>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/3754/Signed-off-by: Ralf Baechle <ralf@linux-mips.org>