MAINTAINERS: Include PCI bindings in host bridge entry

Almost all PCI bindings are controller bindings, so list them under the
PCI native host bridge and endpoint entry.

Link: https://lore.kernel.org/r/20221116215337.1032890-1-robh@kernel.orgSigned-off-by: Rob Herring <robh@kernel.org>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Cc: Lorenzo Pieralisi <lpieralisi@kernel.org>

MAINTAINERS

@@ -15930,6 +15930,7 @@ 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/lpieralisi/pci.git
+F:	Documentation/devicetree/bindings/pci/
 F:	drivers/pci/controller/
 F:	drivers/pci/pci-bridge-emul.c
 F:	drivers/pci/pci-bridge-emul.h