phy: meson-gxl: remove invalid USB3 PHY driver

The registers which are managed by the meson-gxl-usb3 PHY driver are
actually "USB control" registers (which are "glue" registers which
manage OTG detection and routing of the OTG capable port between the
DWC2 peripheral-only controller and the DWC3 host-only controller).

Drop the meson-gxl-usb3 PHY driver now that the dwc3-meson-gxl-usb
driver supports the USB control registers on GXL and GXM SoCs (these
were previously managed by the meson-gxl-usb3 PHY driver).

Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
diff --git a/drivers/phy/Makefile b/drivers/phy/Makefile
index 74e8d93..c839c25 100644
--- a/drivers/phy/Makefile
+++ b/drivers/phy/Makefile
@@ -17,7 +17,7 @@
 obj-$(CONFIG_PHY_RCAR_GEN3) += phy-rcar-gen3.o
 obj-$(CONFIG_PHY_STM32_USBPHYC) += phy-stm32-usbphyc.o
 obj-$(CONFIG_MESON_GXBB_USB_PHY) += meson-gxbb-usb2.o
-obj-$(CONFIG_MESON_GXL_USB_PHY) += meson-gxl-usb2.o meson-gxl-usb3.o
+obj-$(CONFIG_MESON_GXL_USB_PHY) += meson-gxl-usb2.o
 obj-$(CONFIG_MESON_G12A_USB_PHY) += meson-g12a-usb2.o meson-g12a-usb3-pcie.o
 obj-$(CONFIG_MSM8916_USB_PHY) += msm8916-usbh-phy.o
 obj-$(CONFIG_OMAP_USB2_PHY) += omap-usb2-phy.o