There are two versions of the USB host controller PPI, and only the
newer one, called PEI_USB2_HOST_CONTROLLER_PPI, is actually produced by
the EHCI and XHCI host controller PEIMs in EDK2. (The other PPI was only
produced by UhciPei which has been removed)
So remove all the conditionally executed code based on the distinction
between the two PPIs, and only support the newer one.
Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
834586f316