Staging: w35und: remove timer wrappers

This patch removes the OS_TIMER and related wrappers from driver code. The
patch also changes the code to use msecs_to_jiffies() for setting up
timer->expires.

Acked-by: Pavel Machek <pavel@suse.cz>
Signed-off-by: Pekka Enberg <penberg@cs.helsinki.fi>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>