drm/modes: Move named modes parsing to a separate function

The current construction of the named mode parsing doesn't allow to extend
it easily. Let's move it to a separate function so we can add more
parameters and modes.

In order for the tests to still pass, some extra checks are needed, so
it's not a 1:1 move.

Reviewed-by: Noralf Trønnes <[email protected]>
Tested-by: Mateusz Kwiatkowski <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Maxime Ripard <[email protected]>

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