platform/x86: panasonic-laptop: Use acpi_video_get_backlight_type()

Use acpi_video_get_backlight_type() to determine if we should register
the panasonic specific backlight interface. To avoid registering this
on systems where the ACPI or GPU native backlight control methods
should be used instead.

Tested-by: Stefan Seyfried <[email protected]>
Tested-by: Kenneth Chan <[email protected]>
Signed-off-by: Hans de Goede <[email protected]>
Reviewed-by: Andy Shevchenko <[email protected]>
Link: https://lore.kernel.org/r/[email protected]

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