drm/bridge: tc358767: Simplify AUX data read

Simplify AUX data read by removing index arithmetic and shifting with
a helper function that does two things:

    1. Fetch data from up to 4 32-bit registers from the chip
    2. Copy read data into user provided array.

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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