drm/connector: Add a function to lookup a TV mode by its name

As part of the command line parsing rework coming in the next patches,
we'll need to lookup drm_connector_tv_mode values by their name, already
defined in drm_tv_mode_enum_list.

In order to avoid any code duplication, let's do a function that will
perform a lookup of a TV mode name and return its value.

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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