arm64: msmcortex_defconfig: Enable Nop USB transciever driver

Enable NOP_USB_XCEIV config to compile USB PHY generic driver,
which is required for simulator platforms where virtual PHYs
are used.

Change-Id: Ib6ffaa34a60cbb12dd3671c023c4cb8b33013285
Signed-off-by: Vijayavardhan Vennapusa <vvreddy@codeaurora.org>