meta-phosphor: logging: Add symlink to git

Add a symbolic link to phosphor-logging.bb name _git.bb and set the
preferred version for the recipe.

Change-Id: Icf88a90d26028ae36c027cca43d98d0f1512cbc7
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 7d95900..b3bc397 100644
--- a/conf/distro/include/phosphor-defaults.inc
+++ b/conf/distro/include/phosphor-defaults.inc
@@ -247,3 +247,4 @@
 
 PREFERRED_VERSION_phosphor-gpio-monitor = "1.0"
 PREFERRED_VERSION_network = "1.0"
+PREFERRED_VERSION_phosphor-logging = "1.0"
diff --git a/recipes-phosphor/logging/phosphor-logging_git.bb b/recipes-phosphor/logging/phosphor-logging_git.bb
new file mode 120000
index 0000000..b66762d
--- /dev/null
+++ b/recipes-phosphor/logging/phosphor-logging_git.bb
@@ -0,0 +1 @@
+phosphor-logging.bb
\ No newline at end of file