Add in-tree OEM IPMI provider infrastructure

Change-Id: I341af91571b95f74e12def273c6cddf2b72c7884
Signed-off-by: Vernon Mauery <vernon.mauery@gmail.com>
diff --git a/meson.build b/meson.build
index a492697..0804494 100644
--- a/meson.build
+++ b/meson.build
@@ -366,3 +366,6 @@
 
 # HW Transport
 subdir('transport')
+
+# OEM provider libraries
+subdir('oem')