Makefile: Fix definition of pxe-*.bin blobs

* Remove 2nd entry for pxe-pcnet.bin.
  This kind of error can be avoided by sorting
  entries. So all pxe-*.bin entries are now sorted
  alphabetically.
* Rename pxe-eepro100.bin -> pxe-i82559er.bin.
  This change completes another patch which did
  the rename on the pxe image for i82559er.
Signed-off-by: NStefan Weil <weil@mail.berlios.de>
Signed-off-by: NAnthony Liguori <aliguori@us.ibm.com>

Makefile

@@ -253,8 +253,9 @@ common  de-ch  es     fo  fr-ca  hu     ja  mk  nl-be      pt  sl     tr
 ifdef INSTALL_BLOBS
 BLOBS=bios.bin vgabios.bin vgabios-cirrus.bin ppc_rom.bin \
 video.x openbios-sparc32 openbios-sparc64 openbios-ppc \
-pxe-ne2k_pci.bin pxe-rtl8139.bin pxe-pcnet.bin pxe-e1000.bin \
-pxe-virtio.bin pxe-eepro100.bin pxe-pcnet.bin \
+pxe-e1000.bin pxe-i82559er.bin \
+pxe-ne2k_pci.bin pxe-pcnet.bin \
+pxe-rtl8139.bin pxe-virtio.bin \
 bamboo.dtb petalogix-s3adsp1800.dtb \
 multiboot.bin
 else