s390x/pci: Move header files to include/hw/s390x

Seems a more appropriate location for them.

Signed-off-by: Matthew Rosato <mjrosato@linux.ibm.com>
Reviewed-by: Cornelia Huck <cohuck@redhat.com>
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
diff --git a/MAINTAINERS b/MAINTAINERS
index 8c744a9..2c22bbc 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -1436,6 +1436,7 @@
 M: Matthew Rosato <mjrosato@linux.ibm.com>
 S: Supported
 F: hw/s390x/s390-pci*
+F: include/hw/s390x/s390-pci*
 L: qemu-s390x@nongnu.org
 
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