drm/tiny/repaper: Make driver OF-independent

There is one OF call in the driver that limits its area of use.
Replace it to generic device_get_match_data() and get rid of OF dependency.

While here, cast SPI driver data to certain enumerator type.

Cc: Noralf Trønnes <[email protected]>
Cc: [email protected]
Cc: David Airlie <[email protected]>
Cc: Daniel Vetter <[email protected]>
Cc: David Lechner <[email protected]>
Signed-off-by: Andy Shevchenko <[email protected]>
Reviewed-by: Sam Ravnborg <[email protected]>
Signed-off-by: Sam Ravnborg <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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