drm: move native byte order quirk to new drm_driver_legacy_fb_format function

Turns out we need the pixel format fixup not only for the addfb ioctl,
but also for fbdev emulation code.

Ideally we would place it in drm_mode_legacy_fb_format().  That would
create alot of churn though, and most drivers don't care because they
never ever run on a big endian platform.  So add a new
drm_driver_legacy_fb_format() function instead which looks at the
mode_config->quirk_addfb_prefer_host_byte_order flag.

Signed-off-by: Gerd Hoffmann <[email protected]>
Reviewed-by: Daniel Vetter <[email protected]>
Link: http://patchwork.freedesktop.org/patch/msgid/[email protected]

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