Gerrit: Update .gitreview to new location

Change-Id: If09018fead554a66cb7e415cbe3b3dfc47c9e8ef
diff --git a/.gitreview b/.gitreview
index 3745509..ec14baf 100644
--- a/.gitreview
+++ b/.gitreview
@@ -1,5 +1,4 @@
 [gerrit]
 host=review.trustedfirmware.org
 port=29418
-project=trusted-firmware-m
-
+project=TF-M/trusted-firmware-m