usb: phy: MAINTAINERS: mark Freescale USB PHY as orphaned

Emails to the only maintainer bounce:

  <ran.wang_1@nxp.com>: host nxp-com.mail.protection.outlook.com[52.101.68.39]
  said: 550 5.4.1 Recipient address rejected: Access denied.

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/20240327175308.520317-1-krzysztof.kozlowski@linaro.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>