usb: gadget: mv_u3d: drop ARCH dependency

this driver compiles fine everywhere which
means we can use linux-next to compile it
for us frequently.

By dropping the arch dependency, we also
ensure driver writers don't add virtual
arch-depdencies to the driver by e.g. using
the wrong headers.

While at that, fix Marvell's USB3 PHY dependency,
that's the driver which depends on CPU_MM3, not
mv_u3d_core.

Signed-off-by: Felipe Balbi <balbi@ti.com>
diff --git a/drivers/usb/phy/Kconfig b/drivers/usb/phy/Kconfig
index 7e8fe0f..372db48 100644
--- a/drivers/usb/phy/Kconfig
+++ b/drivers/usb/phy/Kconfig
@@ -45,7 +45,7 @@
 
 config MV_U3D_PHY
 	bool "Marvell USB 3.0 PHY controller Driver"
-	depends on USB_MV_U3D
+	depends on CPU_MMP3
 	help
 	  Enable this to support Marvell USB 3.0 phy controller for Marvell
 	  SoC.