driver-core: add test module for asynchronous probing

This test module tries to test asynchronous driver probing by having a
driver that sleeps for an extended period of time (5 secs) in its
probe() method. It measures the time needed to register this driver
(with device already registered) and a new device (with driver already
registered). The module will fail to load if the time spent in register
call is more than half the probing sleep time.

As a sanity check the driver will then try to synchronously register
driver and device and fail if registration takes less than half of the
probing sleep time.

Signed-off-by: Dmitry Torokhov <[email protected]>
Reviewed-by: Olof Johansson <[email protected]>
Signed-off-by: Guenter Roeck <[email protected]>
Signed-off-by: Thierry Escande <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>

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