MAINTAINERS: Cover hw/ppc/ppc440_uc.c with Sam460ex board

hw/ppc/ppc440_uc.c implements the TYPE_PPC460EX_PCIE_HOST
device, which is used by the aCube Sam460ex board.

Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Acked-by: BALATON Zoltan <balaton@eik.bme.hu>
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>

MAINTAINERS

@@ -1495,6 +1495,7 @@ M: BALATON Zoltan <balaton@eik.bme.hu>
 L: qemu-ppc@nongnu.org
 S: Maintained
 F: hw/ppc/sam460ex.c
+F: hw/ppc/ppc440_uc.c
 F: hw/ppc/ppc440_pcix.c
 F: hw/display/sm501*
 F: hw/ide/sii3112.c