drm/bridge: tc358767: Use reported AUX transfer size

Don't assume that requested data transfer size is the same as amount
of data that was transferred. Change the code to get that information
from DP0_AUXSTATUS instead.

Since the check for AUX_BUSY in tc_aux_get_status() is pointless (it
will always called after tc_aux_wait_busy()) and there's only one user
of it, inline its code into tc_aux_transfer() instead of trying to
accommodate the change above.

Signed-off-by: Andrey Smirnov <[email protected]>
Reviewed-by: Andrzej Hajda <[email protected]>
Reviewed-by: Tomi Valkeinen <[email protected]>
Cc: Andrzej Hajda <[email protected]>
Cc: Laurent Pinchart <[email protected]>
Cc: Tomi Valkeinen <[email protected]>
Cc: Andrey Gusakov <[email protected]>
Cc: Philipp Zabel <[email protected]>
Cc: Cory Tusar <[email protected]>
Cc: Chris Healy <[email protected]>
Cc: Lucas Stach <[email protected]>
Cc: [email protected]
Cc: [email protected]
Signed-off-by: Andrzej Hajda <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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