ARM: dts: bcm28155-ap: leave camldo1 on to fix reboot

The BCM28155-AP board has a bootloader that expects the camldo1
regulator to be enabled on entry. Currently, the camldo1 regulator
is disabled when no longer in use as is the case during a reboot /
warm reset. This causes the early bootloader to hang upon entry. Add
regulator-always-on to the camldo1 constraint to fix reboot.

Reported-by: Alex Elder <elder@linaro.org>
Signed-off-by: Matt Porter <mporter@linaro.org>
Tested-by: Alex Elder <elder@linaro.org>

arch/arm/boot/dts/bcm28155-ap.dts

@@ -89,6 +89,7 @@
 		camldo1_reg: camldo1 {
 			regulator-min-microvolt = <3300000>;
 			regulator-max-microvolt = <3300000>;
+			regulator-always-on;
 		};
 
 		sdldo_reg: sdldo {