usb: phy: make it a menuconfig

We already have a considerable amount of USB
PHY drivers, making it a menuconfig just
prevents us from adding too much churn to
USB's menuconfig.

While at that, also select USB_OTG_UTILS from
this new menuconfig just to keep backwards
compatibility until we manage to remove
that symbol.

Signed-off-by: Felipe Balbi <balbi@ti.com>
diff --git a/drivers/usb/phy/Makefile b/drivers/usb/phy/Makefile
index 34488ce..d10a8b3 100644
--- a/drivers/usb/phy/Makefile
+++ b/drivers/usb/phy/Makefile
@@ -4,7 +4,7 @@
 
 ccflags-$(CONFIG_USB_DEBUG) := -DDEBUG
 
-obj-$(CONFIG_USB_OTG_UTILS)		+= phy.o
+obj-$(CONFIG_USB_PHY)			+= phy.o
 
 # transceiver drivers, keep the list sorted