MAINTAINERS: Add an entry for the MacIO device headers

Missed while moved in 7092e84d.
Signed-off-by: NPhilippe Mathieu-Daudé <f4bug@amsat.org>
Signed-off-by: NDavid Gibson <david@gibson.dropbear.id.au>

MAINTAINERS

@@ -766,8 +766,9 @@ F: hw/ppc/mac_newworld.c
 F: hw/pci-host/uninorth.c
 F: hw/pci-bridge/dec.[hc]
 F: hw/misc/macio/
-F: include/hw/ppc/mac_dbdma.h
 F: hw/nvram/mac_nvram.c
+F: include/hw/misc/macio/
+F: include/hw/ppc/mac_dbdma.h
 
 Old World
 M: Alexander Graf <agraf@suse.de>