drm/modes: Introduce the tv_mode property as a command-line option

Our new tv mode option allows to specify the TV mode from a property.
However, it can still be useful, for example to avoid any boot time
artifact, to set that property directly from the kernel command line.

Let's add some code to allow it, and some unit tests to exercise that code.

Reviewed-by: Noralf Trønnes <[email protected]>
Tested-by: Mateusz Kwiatkowski <[email protected]>
Acked-in-principle-or-something-like-that-by: Daniel Vetter <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Maxime Ripard <[email protected]>

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