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: Ludovic Desroches <[e-mail]>
Fixes: 1b53e3416dd0 ("ARM: at91/dt: sama5d3 xplained: add fixed regulator for vmmc0")
Cc: [e-mail] #4.3 and later
Signed-off-by: Nicolas Ferre <[e-mail]>

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

···
 		regulator-name = "mmc0-card-supply";
 		regulator-min-microvolt = <3300000>;
 		regulator-max-microvolt = <3300000>;
+		regulator-always-on;
 	};
 
 	gpio_keys {