staging: wilc1000: rename u8NoIfcs in the struct wilc

This patch renames u8NoIfcs of the struct wilc to the vif_num to avoid
CamelCase naming convention.

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