ARM: dts: am57xx-beagle-x15-revb1: Fix supply name used for MMC1 IO lines

The dt binding documentation of omap-hsmmc recommends using
"vmmc_aux" for IO supply lines. However
commit 0af28cc9 ("ARM: dts: am57xx-beagle-x15: Add support
for rev B1") added it as "vmmc-aux". Now that anyways it
needs to be fixed, use the generic "vqmmc" binding instead of
the deprecated "vmmc_aux".

Fixes: commit 0af28cc9 ("ARM: dts: am57xx-beagle-x15: Add
support for rev B1")
Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>

arch/arm/boot/dts/am57xx-beagle-x15-revb1.dts

@@ -20,7 +20,7 @@ &tpd12s015 {
 
 &mmc1 {
 	vmmc-supply = <&vdd_3v3>;
-	vmmc-aux-supply = <&ldo1_reg>;
+	vqmmc-supply = <&ldo1_reg>;
 };
 
 /* errata i880 "Ethernet RGMII2 Limited to 10/100 Mbps" */