drm: lcdif: Determine bus format and flags in ->atomic_check()

Instead of determining LCDIF output bus format and bus flags in
->atomic_enable(), do that in ->atomic_check().  This is a
preparation for the upcoming patch to check consistent bus format
and bus flags across all first downstream bridges in ->atomic_check().
New lcdif_crtc_state structure is introduced to cache bus format
and bus flags states in ->atomic_check() so that they can be read
in ->atomic_enable().

Tested-by: Alexander Stein <[email protected]>
Reviewed-by: Alexander Stein <[email protected]>
Reviewed-by: Marek Vasut <[email protected]>
Signed-off-by: Liu Ying <[email protected]>
Signed-off-by: Marek Vasut <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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