arm64: dts: renesas: salvator-common: enable usb3_phy0 node

This patch enables usb3_phy0 node for Salvator-X[S].

Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>