usb: phy: Improve Kconfig help for CONFIG_USB_PHY
The previous text confused users by not describing the very common (e.g. x86 PC) sitations where no PHY driver is necessary. Signed-off-by: NGeorge Spelvin <linux@horizon.com> Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>
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