meson: Add subprojects file

Signed-off-by: George Liu <liuxiwei@inspur.com>
Change-Id: Ib8f3c483de3731b3b20d87cd77ec8d82167dff95
diff --git a/subprojects/sdbusplus.wrap b/subprojects/sdbusplus.wrap
new file mode 100644
index 0000000..7b076d0
--- /dev/null
+++ b/subprojects/sdbusplus.wrap
@@ -0,0 +1,6 @@
+[wrap-git]
+url = https://github.com/openbmc/sdbusplus.git
+revision = HEAD
+
+[provide]
+sdbusplus = sdbusplus_dep