staging: wilc1000: rename au8IPAddr of struct set_ip_addr

This patch renames au8IPAddr of struct set_ip_addr to ip_addr to
avoid CamelCase naming convention.

Signed-off-by: Leo Kim <leo.kim@atmel.com>
Signed-off-by: Tony Cho <tony.cho@atmel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>