add repohooks to all groups

Using the --groups option with repo init will restrict which repos are
downloaded to only the specified ones.  Unfortunately, the <repohooks>
logic will always fire regardless of the selected group (and cannot be
restricted), which means you'll get an error when trying to upload like:
ERROR: Couldn't find repo hook: ".../tools/repohooks/pre-upload.py"
Add the repohooks repo to every major active group so that it gets
synced/checked out too.  Hopefully this should cover most teams.
Bug: 28295071
Test: `repo init -g adt-infra && repo sync` pulled down the repohooks repo
Change-Id: If0295d7bbdd2840625fa79a76a5ecf11792a601a

default.xml

@@ -539,7 +539,7 @@
   <project path="tools/idea" name="platform/tools/idea" groups="notdefault,tools" />
   <project path="tools/loganalysis" name="platform/tools/loganalysis" groups="notdefault,tradefed" />
   <project path="tools/motodev" name="platform/tools/motodev" groups="notdefault,motodev" />
-  <project path="tools/repohooks" name="platform/tools/repohooks" />
+  <project path="tools/repohooks" name="platform/tools/repohooks" groups="adt-infra,cts,eclipse,motodev,pdk,tools,tradefed" />
   <project path="tools/studio/cloud" name="platform/tools/studio/cloud" groups="notdefault,tools" />
   <project path="tools/swt" name="platform/tools/swt" groups="notdefault,tools" />
   <project path="tools/test/connectivity" name="platform/tools/test/connectivity" groups="pdk" />