ACPI: video: Don't enable fallback path for creating ACPI backlight by default

ACPI: video: Don't enable fallback path for creating ACPI backlight by default

The ACPI video detection code has a module parameter
`register_backlight_delay` which is currently configured to 8 seconds.
This means that if after 8 seconds of booting no native driver has created
a backlight device then the code will attempt to make an ACPI video
backlight device.

This was intended as a safety mechanism with the backlight overhaul that
occurred in kernel 6.1, but as it doesn't appear necesssary set it to be
disabled by default.

Suggested-by: Hans de Goede <[email protected]>
Signed-off-by: Mario Limonciello <[email protected]>
Reviewed-by: Hans de Goede <[email protected]>
Signed-off-by: Rafael J. Wysocki <[email protected]>