apalis/colibri_t30: fix usb dm regression

Unfortunately currently both Apalis T30 as well as Colibri T30 crash
upon starting USB host support. This is due to the following patch not
having taken into account that our T30 device trees were defaulting to
peripheral only mode instead of otg:

commit ddb9a502
dm: usb: tegra: Move most of init/uninit into a function

This patch fixes this by defaulting to otg now.
Signed-off-by: NMarcel Ziswiler <marcel.ziswiler@toradex.com>
Acked-by: NStephen Warren <swarren@nvidia.com>
Signed-off-by: NTom Warren <twarren@nvidia.com>

arch/arm/dts/tegra30-apalis.dts

@@ -267,7 +267,7 @@
 	/* EHCI instance 0: USB1_DP/N -> USBO1_DP/N */
 	usb@7d000000 {
 		status = "okay";
-		dr_mode = "peripheral";
+		dr_mode = "otg";
 		/* USBO1_EN */
 		nvidia,vbus-gpio = <&gpio TEGRA_GPIO(T, 5) GPIO_ACTIVE_HIGH>;
 	};

arch/arm/dts/tegra30-colibri.dts

@@ -76,7 +76,7 @@
 	/* EHCI instance 0: USB1_DP/N -> USBC_P/N */
 	usb@7d000000 {
 		status = "okay";
-		dr_mode = "peripheral";
+		dr_mode = "otg";
 	};
 
 	/* EHCI instance 1: USB2_DP/N -> AX88772B */