subprojects: add phosphor-logging

Add wrap file for phosphor-logging to subprojects.

Change-Id: I57738bb307b66f6f899b359f6b36d2e0d74d7363
Signed-off-by: Jagpal Singh Gill <paligill@gmail.com>
diff --git a/subprojects/phosphor-logging.wrap b/subprojects/phosphor-logging.wrap
new file mode 100644
index 0000000..71eee8b
--- /dev/null
+++ b/subprojects/phosphor-logging.wrap
@@ -0,0 +1,6 @@
+[wrap-git]
+url = https://github.com/openbmc/phosphor-logging.git
+revision = HEAD
+
+[provide]
+phosphor-logging = phosphor_logging_dep