omni: Welcome Android 15

Change-Id: I00bdd7fed58b8433727dda7e15e5334549f4ef8e
diff --git a/build/tools/roomservice.py b/build/tools/roomservice.py
index 61e3a11..970ddca 100755
--- a/build/tools/roomservice.py
+++ b/build/tools/roomservice.py
@@ -38,7 +38,7 @@
 # set this to the default remote to use in repo
 default_rem = "omnirom2"
 # set this to the default revision to use (branch/tag name)
-default_rev = "android-14.0"
+default_rev = "android-15"
 # set this to the remote that you use for projects from your team repos
 # example fetch="https://github.com/omnirom"
 default_team_rem = "omnirom2"