ARM: dts: tps65910 backup battery regulator

This patch adds a devicetree node for the backup battery regulator.
Signed-off-by: Markus Pargmann <mpa@pengutronix.de>
Signed-off-by: Tony Lindgren <tony@atomide.com>

arch/arm/boot/dts/tps65910.dtsi

@@ -82,5 +82,10 @@ vmmc_reg: regulator@12 {
 			reg = <12>;
 			regulator-compatible = "vmmc";
 		};
+
+		vbb_reg: regulator@13 {
+			reg = <13>;
+			regulator-compatible = "vbb";
+		};
 	};
 };