meta-phosphor: state-manager: Add symlink to git

Add a symbolic link to phosphor-state-manager.bb named _git.bb and set
the preferred version for the recipe.

Change-Id: I9f4522bf2ace484dee3f3039e359889dd1035ef2
Signed-off-by: Patrick Venture <venture@google.com>
diff --git a/conf/distro/include/phosphor-defaults.inc b/conf/distro/include/phosphor-defaults.inc
index b3bc397..f845e7a 100644
--- a/conf/distro/include/phosphor-defaults.inc
+++ b/conf/distro/include/phosphor-defaults.inc
@@ -248,3 +248,4 @@
 PREFERRED_VERSION_phosphor-gpio-monitor = "1.0"
 PREFERRED_VERSION_network = "1.0"
 PREFERRED_VERSION_phosphor-logging = "1.0"
+PREFERRED_VERSION_phosphor-state-manager = "1.0"
diff --git a/recipes-phosphor/state/phosphor-state-manager_git.bb b/recipes-phosphor/state/phosphor-state-manager_git.bb
new file mode 120000
index 0000000..8a32ae2
--- /dev/null
+++ b/recipes-phosphor/state/phosphor-state-manager_git.bb
@@ -0,0 +1 @@
+phosphor-state-manager.bb
\ No newline at end of file