staging: west bridge, addition of common lock on cyasdevice

This patch adds and initializes a common lock to
cyasdevice module. This is meant to be used in order
to avoid error scenarios where the device module
could be called by both the block and gadget modules
at the same time.

Signed-off-by: David Cross <david.cross@cypress.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>