MAINTAINERS: Add Logan Gunthorpe as P2PDMA maintainer

Add a P2PDMA entry to make sure Logan is aware of changes to that area.
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Acked-by: Logan Gunthorpe <logang@deltatee.com>

MAINTAINERS

@@ -14717,6 +14717,19 @@ L:	linux-pci@vger.kernel.org
 S:	Supported
 F:	Documentation/PCI/pci-error-recovery.rst
 
+PCI PEER-TO-PEER DMA (P2PDMA)
+M:	Bjorn Helgaas <bhelgaas@google.com>
+M:	Logan Gunthorpe <logang@deltatee.com>
+L:	linux-pci@vger.kernel.org
+S:	Supported
+Q:	https://patchwork.kernel.org/project/linux-pci/list/
+B:	https://bugzilla.kernel.org
+C:	irc://irc.oftc.net/linux-pci
+T:	git git://git.kernel.org/pub/scm/linux/kernel/git/helgaas/pci.git
+F:	Documentation/driver-api/pci/p2pdma.rst
+F:	drivers/pci/p2pdma.c
+F:	include/linux/pci-p2pdma.h
+
 PCI MSI DRIVER FOR ALTERA MSI IP
 M:	Joyce Ooi <joyce.ooi@intel.com>
 L:	linux-pci@vger.kernel.org