apm821xx: fix fan control on highest step

This patch removes a typo (extra "0") so that the 'cpu-alert6'
step is triggered once the system reaches 85°C.

Note: Unless the WNDR4700 is placed in an hot oven, the
hardware-monitor will never reach this value.

Signed-off-by: Christian Lamparter <chunkeey@gmail.com>

target/linux/apm821xx/dts/netgear-wndr4700.dts

@@ -79,7 +79,7 @@
 				};
 
 				cpu_alert6: cpu-alert6 {
-					temperature = <850000>; /* millicelsius */
+					temperature = <85000>; /* millicelsius */
 					hysteresis = <2000>; /* millicelsius */
 					type = "active";
 				};