ARM: tegra: nexus7: Remove monitored-battery property

The bq27541 Linux kernel driver will try to reprogram controller based
on the values from monitored-battery node, but it fails to do so because
controller was locked by manufacturer. Still this is a very undesirable
behaviour, hence let's remove the optional battery node.
Signed-off-by: NDmitry Osipenko <digetx@gmail.com>
Signed-off-by: NThierry Reding <treding@nvidia.com>

arch/arm/boot/dts/tegra30-asus-nexus7-grouper-common.dtsi

@@ -927,7 +927,6 @@
 			compatible = "ti,bq27541";
 			reg = <0x55>;
 			power-supplies = <&power_supply>;
-			monitored-battery = <&battery_cell>;
 		};
 
 		power_supply: charger@6a {