subprojects: remove stray sdbusplus link

This symlink appears to have been added by mistake and causes this error
when building with sdbusplus as a subproject:

fatal: could not create work tree dir 'sdbusplus': File exists

Fixes: 83b1e9b4a67136d61a51391ff18f20160cbd83d2
Signed-off-by: Brad Bishop <bradleyb@fuzziesquirrel.com>
Change-Id: Ie86dc6c1f77ba12dd9e1fd94caf49ea351ab3967
diff --git a/subprojects/sdbusplus b/subprojects/sdbusplus
deleted file mode 120000
index 003e012..0000000
--- a/subprojects/sdbusplus
+++ /dev/null
@@ -1 +0,0 @@
-../../sdbusplus
\ No newline at end of file