Revert "maintainers: fix Ruud's email"

The email for Ruud in the maintainers file actually matches his gerrit
ID.

This reverts commit 2a4e2173fdc8213c2353a4b79c8280ce113317b4.

Change-Id: I6739c9c383f485460d8ad72563c25e847ee04c57
Signed-off-by: Anas Nashif <anas.nashif@intel.com>
diff --git a/MAINTAINERS b/MAINTAINERS
index 1dee111..eeb338b 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -60,7 +60,7 @@
 		-----------------------------------
 
 ARC ARCHITECTURE
-M:	Ruud Derwig <rderwig@synopsys.com>
+M:	Ruud Derwig <Ruud.Derwig@synopsys.com>
 M:	Chuck Jordan <cjordan@synopsys.com>
 M:	Benjamin Walsh <benjamin.walsh@windriver.com>
 S:	Supported