staging: wilc1000: remove typedef from wilc_hif_func_t

This patch removes typedef from the struct wilc_hif_func_t and
renames it to wilc_hif_func.

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>