ARM: dts: at91: sama5d3 Xplained: don't disable hsmci regulator

If enabling the hsmci regulator on card detection, the board can reboot
on sd card insertion. Keeping the regulator always enabled fixes this
issue.
Signed-off-by: NLudovic Desroches <ludovic.desroches@atmel.com>
Fixes: 1b53e341 ("ARM: at91/dt: sama5d3 xplained: add fixed regulator for vmmc0")
Cc: stable@vger.kernel.org #4.3 and later
Signed-off-by: NNicolas Ferre <nicolas.ferre@atmel.com>

arch/arm/boot/dts/at91-sama5d3_xplained.dts

@@ -303,6 +303,7 @@
 		regulator-name = "mmc0-card-supply";
 		regulator-min-microvolt = <3300000>;
 		regulator-max-microvolt = <3300000>;
+		regulator-always-on;
 	};
 
 	gpio_keys {