drm/fb-helper: Add fill_info() functions

The fbdev split between fix and var information is kinda
pointless for drm drivers since everything is fixed: The fbdev
emulation doesn't support changing modes at all.

Create a new simplified helper and use it in the generic fbdev
helper code. Follow-up patches will beef it up more and roll
it out to all drivers.

v2: We need to keep sizes, since they might not match the fb dimensions
(Noralf)

v3: Fix typo in commit message and remove extraneous line in kerneldoc (Noralf)

Reviewed-by: Noralf Trønnes <[email protected]>
Reviewed-by: Alex Deucher <[email protected]>
Cc: Noralf Trønnes <[email protected]>
Signed-off-by: Daniel Vetter <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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