arm64: dts: imx8mq-librem5: add brightness levels to led-backlight

Add brightness-levels and default-brightness-level properties to
the librem5 board description that have been used for a long time.

Signed-off-by: Martin Kepplinger <martin.kepplinger@puri.sm>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>
This commit is contained in:
Martin Kepplinger 2023-03-09 21:45:59 +01:00 • committed by Shawn Guo
commit 956fdfe744