drm/udl: Replace semaphore with a simple wait queue

UDL driver uses a semaphore for controlling the emptiness of FIFO in a
slightly funky way.  This patch replaces it with a wait queue and
controls the emptiness with the standard wait_event*() macro instead,
which is a more straightforward implementation.

While we are at it, drop the dead code for delayed semaphore down,
too.

Tested-by: Thomas Zimmermann <[email protected]>
Signed-off-by: Takashi Iwai <[email protected]>
Signed-off-by: Thomas Zimmermann <[email protected]>
Reviewed-by: Thomas Zimmermann <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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