sparc: Add slavio_misc.c and eccmemctl.c to the MAINTAINERS file

Both files seem to belong to the Sun4m machine.
Reviewed-by: NStefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: NThomas Huth <thuth@redhat.com>

MAINTAINERS

@@ -710,6 +710,8 @@ S: Maintained
 F: hw/sparc/sun4m.c
 F: hw/dma/sparc32_dma.c
 F: hw/dma/sun4m_iommu.c
+F: hw/misc/eccmemctl.c
+F: hw/misc/slavio_misc.c
 F: include/hw/sparc/sparc32_dma.h
 F: include/hw/sparc/sun4m.h
 F: pc-bios/openbios-sparc32