usb: dwc3-meson-g12a: Select PHY instead of imply PHY

Imply means you can turn off the option and expect things to work
- "it's a good idea to have X enabled" is when to use imply
- "you must have X for Y to work" is when to use select

Use "select" here.

Signed-off-by: Marek Vasut <marex@denx.de>
Reviewed-by: Mattijs Korpershoek <mkorpershoek@baylibre.com>
diff --git a/drivers/usb/dwc3/Kconfig b/drivers/usb/dwc3/Kconfig
index d1665f8..c0c8c16 100644
--- a/drivers/usb/dwc3/Kconfig
+++ b/drivers/usb/dwc3/Kconfig
@@ -40,7 +40,7 @@
 config USB_DWC3_MESON_G12A
 	bool "Amlogic Meson G12A USB wrapper"
 	depends on DM_USB && USB_DWC3 && ARCH_MESON
-	imply PHY
+	select PHY
 	help
 	  Select this for Amlogic Meson G12A Platforms.
 	  This wrapper supports Host and Peripheral operation modes.
@@ -48,7 +48,7 @@
 config USB_DWC3_MESON_GXL
 	bool "Amlogic Meson GXL USB wrapper"
 	depends on DM_USB && USB_DWC3 && ARCH_MESON
-	imply PHY
+	select PHY
 	help
 	  Select this for Amlogic Meson GXL and GXM Platforms.
 	  This wrapper supports Host and Peripheral operation modes.