docs-rst: Add a new directory for PCI documentation

Add a new directory in the driver API guide for PCI-specific documentation.

This is in preparation for adding a new PCI P2P DMA driver writers guide
which will go in this directory.

Signed-off-by: Logan Gunthorpe <[email protected]>
Signed-off-by: Bjorn Helgaas <[email protected]>
Cc: Jonathan Corbet <[email protected]>
Cc: Mauro Carvalho Chehab <[email protected]>
Cc: Greg Kroah-Hartman <[email protected]>
Cc: Vinod Koul <[email protected]>
Cc: Linus Walleij <[email protected]>
Cc: Logan Gunthorpe <[email protected]>
Cc: Thierry Reding <[email protected]>
Cc: Sanyog Kale <[email protected]>
Cc: Sagar Dharia <[email protected]>

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