arm64: dts: ls1028a: default to OTG mode for USB

At the moment, the dtsi will force the dr_mode to host. This is
problematic because it will always turn on the Vbus voltage regardless
if the port is host or device. This might lead to a "shortcut" between
the two USB endpoints because both might have their Vbus supplies
enabled. Therefore, the default should be "otg" for any ports which
aren't host only (from a SoC point of view) and have a user of the dtsi
file overwrite that explicitly.

Move the 'dr_mode = "host";' into the board dts. Now that the dtsi
doesn't set the dr_mode anymore, we can also drop the 'dr_mode = "otg";'
in the board dts because that is the default value if dr_mode is not
set.
Signed-off-by: Michael Walle <michael@walle.cc>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

arch/arm64/boot/dts/freescale/fsl-ls1028a-kontron-sl28.dts

@@ -324,5 +324,6 @@ &usb0 {
 };
 
 &usb1 {
+	dr_mode = "host";
 	status = "okay";
 };

arch/arm64/boot/dts/freescale/fsl-ls1028a-qds.dts

@@ -382,9 +382,11 @@ &sata {
 };
 
 &usb0 {
+	dr_mode = "host";
 	status = "okay";
 };
 
 &usb1 {
+	dr_mode = "host";
 	status = "okay";
 };

arch/arm64/boot/dts/freescale/fsl-ls1028a-rdb.dts

@@ -299,10 +299,10 @@ &sata {
 };
 
 &usb0 {
+	dr_mode = "host";
 	status = "okay";
 };
 
 &usb1 {
-	dr_mode = "otg";
 	status = "okay";
 };

arch/arm64/boot/dts/freescale/fsl-ls1028a.dtsi

@@ -599,7 +599,6 @@ usb0: usb@3100000 {
 			compatible = "fsl,ls1028a-dwc3", "snps,dwc3";
 			reg = <0x0 0x3100000 0x0 0x10000>;
 			interrupts = <GIC_SPI 80 IRQ_TYPE_LEVEL_HIGH>;
-			dr_mode = "host";
 			snps,dis_rxdet_inp3_quirk;
 			snps,quirk-frame-length-adjustment = <0x20>;
 			snps,incr-burst-type-adjustment = <1>, <4>, <8>, <16>;
@@ -610,7 +609,6 @@ usb1: usb@3110000 {
 			compatible = "fsl,ls1028a-dwc3", "snps,dwc3";
 			reg = <0x0 0x3110000 0x0 0x10000>;
 			interrupts = <GIC_SPI 81 IRQ_TYPE_LEVEL_HIGH>;
-			dr_mode = "host";
 			snps,dis_rxdet_inp3_quirk;
 			snps,quirk-frame-length-adjustment = <0x20>;
 			snps,incr-burst-type-adjustment = <1>, <4>, <8>, <16>;