staging: wilc1000: rename Set_machw_change_vir_if function

This patch rename Set_machw_change_vir_if function to set_machw_change_vir_if
to avoid CamelCase naming convention.

Signed-off-by: Leo Kim <leo.kim@atmel.com>
Signed-off-by: Glen Lee <glen.lee@atmel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>