sgi-xp: xpc_uv: Make structure xpc_arch_ops_uv constant

sgi-xp: xpc_uv: Make structure xpc_arch_ops_uv constant

The static xpc_arch_operations structure xpc_arch_ops_uv is only copied
into the structure xpc_arch_ops, after which it is never modified; nor
is it used in any other way. Hence it can be declared as a constant to
prevent unintended modifications of its fields.
Issue found with Coccinelle.

Signed-off-by: Nishka Dasgupta <nishkadg.linux@gmail.com>
Acked-by: Robin Holt <robinmholt@gmail.com>
Link: https://lore.kernel.org/r/20190808080422.16503-1-nishkadg.linux@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>