drm/exynos: fix opencoded use of drm_panel_*

drm_panel_attach() will check if there is a controller
already attached - drop the check in the driver.

Use drm_panel_get_modes() so the driver no longer uses the function
pointer.

Signed-off-by: Sam Ravnborg <[email protected]>
Reviewed-by: Emil Velikov <[email protected]>
Cc: Inki Dae <[email protected]>
Cc: Joonyoung Shim <[email protected]>
Cc: Seung-Woo Kim <[email protected]>
Cc: Kyungmin Park <[email protected]>
Cc: Kukjin Kim <[email protected]>
Cc: Krzysztof Kozlowski <[email protected]>
Cc: [email protected]
Cc: [email protected]
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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