staging: wilc1000: rename the member variable, u16WIDid of wid

This patch renames u16WIDid of struct wid to id.

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>