PCI/P2PDMA: Add Intel Sky Lake-E Root Ports B, C, D to the whitelist

Add the three remaining Intel Sky Lake-E host Root Ports to the whitelist
of p2pdma.

P2P has been tested and is working on this system.

Link: https://lore.kernel.org/r/20200207221219.4309-1-andrew.maier@eideticom.com


Signed-off-by: Andrew Maier <andrew.maier@eideticom.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Logan Gunthorpe <logang@deltatee.com>