e1000: Move out code that will be reused in e1000e

Code that will be shared moved to a separate files.

Signed-off-by: Dmitry Fleytman <dmitry.fleytman@ravellosystems.com>
Signed-off-by: Leonid Bloch <leonid.bloch@ravellosystems.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Jason Wang <jasowang@redhat.com>
diff --git a/MAINTAINERS b/MAINTAINERS
index dc5e536..e379f38 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -980,6 +980,11 @@
 F: hw/mem/nvdimm.c
 F: include/hw/mem/nvdimm.h
 
+e1000x
+M: Dmitry Fleytman <dmitry@daynix.com>
+S: Maintained
+F: hw/net/e1000x*
+
 Subsystems
 ----------
 Audio