platform/x86: thinkpad_acpi: Stop setting led_classdev brightness directly

platform/x86: thinkpad_acpi: Stop setting led_classdev brightness directly

There is no need to set the led_classdev's brightness value from
its set_brightness callback, this is taken care of by the led-core and
thinkpad_acpi really should not be mucking with it.

Note that kbdlight_set_level_and_update() is still used by the old
thinpad_acpi specific sysfs interface for the led, so we cannot
remove it.

Signed-off-by: Hans de Goede <[email protected]>
Acked-by: Henrique de Moraes Holschuh <[email protected]>
Signed-off-by: Andy Shevchenko <[email protected]>
Acked-by: Pavel Machek <[email protected]>