arm64: dts: imx8mq-librem5-r2: set nearlevel to 120

On Birch I can never reach 220 and hence the display would never
turn off. Tests suggest 120 to be a good threshold value for all Birch
devices.
Signed-off-by: NMartin Kepplinger <martin.kepplinger@puri.sm>
Signed-off-by: NShawn Guo <shawnguo@kernel.org>

arch/arm64/boot/dts/freescale/imx8mq-librem5-r2.dts

@@ -25,5 +25,5 @@
 };
 
 &proximity {
-	proximity-near-level = <220>;
+	proximity-near-level = <120>;
 };