staging: wilc1000: rename host_int_get_MacAddress function

This patch rename host_int_get_MacAddress function to hif_get_mac_address
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>