kernel: usb: remove left-over LINUX_5_10 dependency symbol

this should have been removed together with linux 5.4 APM821XX
support. Currently, this didn't hurt or broke something. But it
will in the next stable kernel release.

Signed-off-by: Christian Lamparter <chunkeey@gmail.com>

package/kernel/linux/modules/usb.mk

@@ -1712,7 +1712,7 @@ define KernelPackage/usb3
 	+TARGET_bcm53xx:kmod-usb-bcma \
 	+TARGET_bcm53xx:kmod-phy-bcm-ns-usb3 \
 	+TARGET_ramips_mt7621:kmod-usb-xhci-mtk \
-	+(TARGET_apm821xx_nand&&LINUX_5_10):kmod-usb-xhci-pci-renesas \
+	+TARGET_apm821xx_nand:kmod-usb-xhci-pci-renesas \
 	+TARGET_mvebu_cortexa9:kmod-usb-xhci-pci-renesas
   KCONFIG:= \
 	CONFIG_USB_PCI=y \