kernel: usb: improve support for ath79 target

1. Remove outdated symbol CONFIG_USB_OHCI_ATH79.
The ath79 OHCI USB was already supported by the generic driver
kmod-usb-ohci. And this kernel symbol has been dropped since
upstream commit:
53d473fc1e38 ("usb: host: Remove the deprecated ATH79 USB host config options")

2. Add ath79 USB phy package to the OHCI dependencies.
Both EHCI and OHCI require it on the ath79 target.

Signed-off-by: Shiji Yang <[email protected]>
Link: https://github.com/openwrt/openwrt/pull/16380
Signed-off-by: Hauke Mehrtens <[email protected]>

package/kernel/linux/modules/usb.mk

@@ -272,13 +272,13 @@ $(eval $(call KernelPackage,usb-uhci,1))
 define KernelPackage/usb-ohci
   TITLE:=Support for OHCI controllers
   DEPENDS:= \
+	+TARGET_ath79:kmod-phy-ath79-usb \
 	+TARGET_bcm53xx:kmod-usb-bcma \
 	+TARGET_bcm47xx:kmod-usb-bcma \
 	+TARGET_bcm47xx:kmod-usb-ssb
   KCONFIG:= \
 	CONFIG_USB_OHCI \
 	CONFIG_USB_OHCI_HCD \
-	CONFIG_USB_OHCI_ATH79=y \
 	CONFIG_USB_OHCI_HCD_AT91=y \
 	CONFIG_USB_OHCI_BCM63XX=y \
 	CONFIG_USB_OCTEON_OHCI=y \