meta-openpower: maintainers: remove subtree words

Remove wording about a special case patch submission process.
meta-openpower now follows the same patch submission process
as every other OpenBMC project.

(From meta-openpower rev: ef81fc4f413524d801b973471d796abd55c60854)

Change-Id: I0b81ae851753b6c0d354e496cf4ee5fde7f6abfa
Signed-off-by: Brad Bishop <bradleyb@fuzziesquirrel.com>
diff --git a/meta-openpower/MAINTAINERS b/meta-openpower/MAINTAINERS
index 9b799c2..bfe81de 100644
--- a/meta-openpower/MAINTAINERS
+++ b/meta-openpower/MAINTAINERS
@@ -42,7 +42,4 @@
 START OF MAINTAINERS LIST
 -------------------------
 
-# THIS REPOSITORY HAS A DIFFERENT SUBMISSION PROCESS: this is a subtree in
-# @openbmc and is synced by the maintainer using git-subtree. Please submit
-# changes against @openbmc.
 M:  Brad Bishop <bradleyb@fuzziesquirrel.com> <radsquirrel!>