meta-google: add google-ipmi-sys to obmc-phosphor-image

Add the google-ipmi-sys package to the obmc-phosphor-image
so that it is installed when this layer is included.

Change-Id: Iec062515c149f571f6ff70ce58012aba817579e3
Signed-off-by: Patrick Venture <venture@google.com>
diff --git a/recipes-phosphor/images/obmc-phosphor-image.bbappend b/recipes-phosphor/images/obmc-phosphor-image.bbappend
new file mode 100644
index 0000000..274f710
--- /dev/null
+++ b/recipes-phosphor/images/obmc-phosphor-image.bbappend
@@ -0,0 +1 @@
+OBMC_IMAGE_EXTRA_INSTALL_append = " google-ipmi-sys"