armvirt: 64: enable usb support

It was originally only enabled for the "32" subtarget along with the
"usb" feature which is now also shared by the "64" target

This should fix the phase1 build of armvirt/64

Signed-off-by: Yousong Zhou <yszhou4tech@gmail.com>

target/linux/armvirt/32/config-default

@@ -80,7 +80,6 @@ CONFIG_SWP_EMULATE=y
 CONFIG_SYS_SUPPORTS_APM_EMULATION=y
 # CONFIG_THUMB2_KERNEL is not set
 CONFIG_UNCOMPRESS_INCLUDE="debug/uncompress.h"
-CONFIG_USB_SUPPORT=y
 CONFIG_USE_OF=y
 CONFIG_VECTORS_BASE=0xffff0000
 CONFIG_VFP=y

target/linux/armvirt/config-default

@@ -168,6 +168,7 @@ CONFIG_SRCU=y
 CONFIG_SWIOTLB=y
 CONFIG_TICK_CPU_ACCOUNTING=y
 CONFIG_TREE_RCU=y
+CONFIG_USB_SUPPORT=y
 CONFIG_VIRTIO=y
 CONFIG_VIRTIO_BALLOON=y
 CONFIG_VIRTIO_BLK=y