platform/x86: dell-laptop: Register ctl-led for speaker-mute

platform/x86: dell-laptop: Register ctl-led for speaker-mute

BugLink: https://bugs.launchpad.net/bugs/2015972
Some platforms have the speaker-mute led and
current driver doesn't control it.

If the platform support the control of speaker-mute led, register it

Change-Id: I70ac3007e715a0410dd692f362e51b347ef4488e
Signed-off-by: Koba Ko <koba.ko@canonical.com>
Link: https://lore.kernel.org/r/20230308062414.1048913-1-koba.ko@canonical.com
Reviewed-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
(cherry picked from commit 3ed0b880b71489d59f89b0bc1323ad34a136cca0
linux-next)
Signed-off-by: Koba Ko <koba.ko@canonical.com>
Acked-by: Andrei Gherzan <andrei.gherzan@canonical.com>
Acked-by: Tim Gardner <tim.gardner@canonical.com>
Signed-off-by: Paolo Pisati <paolo.pisati@canonical.com>