arm64: dts: freescale: tqma8mpql: Fix vqmmc-supply

eMMC is supplied by BUCK5 rail. Use the actual regulator instead of
a virtual fixed regulator.

Fixes: 418d1d8 ("arm64: dts: freescale: add initial device tree for TQMa8MPQL with i.MX8MP")
Signed-off-by: Alexander Stein <alexander.stein@ew.tq-group.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

Author: tq-steina

arch/arm64/boot/dts/freescale/imx8mp-tqma8mpql.dtsi

@@ -1,7 +1,8 @@
 // SPDX-License-Identifier: GPL-2.0-or-later OR MIT
 /*
- * Copyright 2021-2022 TQ-Systems GmbH
- * Author: Alexander Stein <alexander.stein@tq-group.com>
+ * Copyright 2021-2025 TQ-Systems GmbH <linux@ew.tq-group.com>,
+ * D-82229 Seefeld, Germany.
+ * Author: Alexander Stein
  */
 
 #include "imx8mp.dtsi"
@@ -23,15 +24,6 @@
 		regulator-max-microvolt = <3300000>;
 		regulator-always-on;
 	};
-
-	/* e-MMC IO, needed for HS modes */
-	reg_vcc1v8: regulator-vcc1v8 {
-		compatible = "regulator-fixed";
-		regulator-name = "VCC1V8";
-		regulator-min-microvolt = <1800000>;
-		regulator-max-microvolt = <1800000>;
-		regulator-always-on;
-	};
 };
 
 &A53_0 {
@@ -197,7 +189,7 @@
 	no-sd;
 	no-sdio;
 	vmmc-supply = <&reg_vcc3v3>;
-	vqmmc-supply = <&reg_vcc1v8>;
+	vqmmc-supply = <&buck5_reg>;
 	status = "okay";
 };