drm/nouveau: Pass along the format info from .fb_create() to drm_helper_mode_fill_fb_struct()

Plumb the format info from .fb_create() all the way to
drm_helper_mode_fill_fb_struct() to avoid the redundant
lookup.

The patch is based on the driver parts of the patchset at Link:
below, which missed converting the nouveau driver.

Due to the absence of this change in the patchset at Link:, after the
Fixed: commit below, nouveau_framebuffer_new() ->
drm_helper_mode_fill_fb_struct() set drm_framebuffer::format incorrectly
to NULL, which lead to the !fb->format WARN() in drm_framebuffer_init()
and causing framebuffer creation to fail. This patch fixes both of these
issues.

v2: Amend the commit log mentioning the functional issues the patch
    fixes. (Tomi)

Cc: Ville Syrjälä <[email protected]>
Cc: Lyude Paul <[email protected]>
Cc: Danilo Krummrich <[email protected]>
Cc: Thomas Zimmermann <[email protected]>
Cc: Maarten Lankhorst <[email protected]>
Cc: Maxime Ripard <[email protected]>
Cc: Tomi Valkeinen <[email protected]>
Cc: [email protected]
Fixes: 41ab92d35ccd ("drm: Make passing of format info to drm_helper_mode_fill_fb_struct() mandatory")
Link: https://lore.kernel.org/all/[email protected]
Acked-by: Alex Deucher <[email protected]>
Acked-by: Danilo Krummrich <[email protected]>
Reviewed-by: James Jones <[email protected]>
Tested-by: Linux Kernel Functional Testing <[email protected]>
Tested-by: James Jones <[email protected]>
Signed-off-by: Imre Deak <[email protected]>
Link: https://lore.kernel.org/r/[email protected]

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