staging: wilc1000: rename hScanTimer of struct host_if_drv

This patch renames hScanTimer of struct host_if_drv to scan_timer
to avoid CamelCase naming convention.
And, remove the relation comment.

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>