staging: wilc1000: rename u16ipadd in host_int_get_ipaddress

This patch renames u16ipadd to ip_addr to remove u16 prefix.
There is no need to use this prefix to show data type of this argument.

Signed-off-by: Chaehyun Lim <chaehyun.lim@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>