drm/sun4i: backend: Simplify the get_id logic

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Using the new helpers introduced since we wrote that code, we can simplify
the code to retrieve the backend ID significantly.

The new code will also allow us to deal nicely with endpoints that don't
have a reg property, as expected in the case where there's a single
endpoint for a given port.

Signed-off-by: Maxime Ripard <maxime.ripard@bootlin.com>
Reviewed-by: Chen-Yu Tsai <wens@csie.org>
Link: https://patchwork.freedesktop.org/patch/msgid/1a9bf911b0a40475da8025859032514131d5397b.1552594551.git-series.maxime.ripard@bootlin.com

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Maxime Ripard 2019-03-14 21:16:22 +01:00

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commit eb40baefb6

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drivers/gpu/drm/sun4i/sun4i_backend.c

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