drm/omap: 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.

For the fbdev case a manual drm_get_format_info() lookup
is needed.

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

Due to the absence of this change in the patchset at Link:, after the
Fixed: commit below, omap_framebuffer_init() ->
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 <ville.syrjala@linux.intel.com>
Cc: Tomi Valkeinen <tomi.valkeinen@ideasonboard.com>
Cc: Thomas Zimmermann <tzimmermann@suse.de>
Cc: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Cc: Maxime Ripard <mripard@kernel.org>
Fixes: 41ab92d35ccd ("drm: Make passing of format info to drm_helper_mode_fill_fb_struct() mandatory")
Reported-by: Mark Brown <broonie@kernel.org>
Closes: https://lore.kernel.org/all/98b3a62c-91ff-4f91-a58b-e1265f84180b@sirena.org.uk
Link: https://lore.kernel.org/all/20250701090722.13645-1-ville.syrjala@linux.intel.com
Tested-by: Mark Brown <broonie@kernel.org>
Tested-by: Linux Kernel Functional Testing <lkft@linaro.org>
Acked-by: Alex Deucher <alexander.deucher@amd.com>
Reviewed-by: Tomi Valkeinen <tomi.valkeinen@ideasonboard.com>
Signed-off-by: Imre Deak <imre.deak@intel.com>
Link: https://lore.kernel.org/r/20250805175752.690504-2-imre.deak@intel.com

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