S390: ccw firmware: Add compiled blob

Now that we have all the source code ready, add a compiled blob into
the QEMU source tree, so that people without access to an s390 compiler
can run the s390-ccw firmware.

Signed-off-by: Alexander Graf <agraf@suse.de>

Makefile

diff --git a/Makefile b/Makefile
index e652764..8aca92f 100644
--- a/Makefile
+++ b/Makefile
@@ -295,6 +295,7 @@
 bamboo.dtb petalogix-s3adsp1800.dtb petalogix-ml605.dtb \
 multiboot.bin linuxboot.bin kvmvapic.bin \
 s390-zipl.rom \
+s390-ccw.img \
 spapr-rtas.bin slof.bin \
 palcode-clipper
 else