meta-ibm: introduce new pstbmc machine

The pstbmc machine (the acronym meaning is still confidential) will be
IBMs next generation server line.

For now, just have it based on p10bmc.

Change-Id: If980484b3acc44455f558661247886a15955c6bb
Signed-off-by: Andrew Geissler <geissonator@yahoo.com>
diff --git a/meta-ibm/conf/templates/default/conf-notes.txt b/meta-ibm/conf/templates/default/conf-notes.txt
index d781b4f..99d7599 100644
--- a/meta-ibm/conf/templates/default/conf-notes.txt
+++ b/meta-ibm/conf/templates/default/conf-notes.txt
@@ -1,5 +1,7 @@
 Example build invocations:
 
+pstbmc:
+MACHINE=pstbmc bitbake obmc-phosphor-image
 p10bmc:
 MACHINE=p10bmc bitbake obmc-phosphor-image
 witherspoon: