MAINTAINERS: Document Bamboo machine and ppc4xx devices

Place it in alphabetical order and add new Devices section ppc4xx to
share file rules with 405 and virtex_ml507.
Signed-off-by: NAndreas Färber <afaerber@suse.de>
Signed-off-by: NAlexander Graf <agraf@suse.de>

MAINTAINERS

@@ -352,6 +352,12 @@ L: qemu-ppc@nongnu.org
 S: Odd Fixes
 F: hw/ppc405_boards.c
 
+Bamboo
+M: Alexander Graf <agraf@suse.de>
+L: qemu-ppc@nongnu.org
+S: Odd Fixes
+F: hw/ppc440_bamboo.c
+
 e500
 M: Alexander Graf <agraf@suse.de>
 M: Scott Wood <scottwood@freescale.com>
@@ -480,6 +486,12 @@ S: Supported
 F: hw/pci*
 F: hw/piix*
 
+ppc4xx
+M: Alexander Graf <agraf@suse.de>
+L: qemu-ppc@nongnu.org
+S: Odd Fixes
+F: hw/ppc4xx*.[hc]
+
 ppce500
 M: Alexander Graf <agraf@suse.de>
 M: Scott Wood <scottwood@freescale.com>