audiopolicy: capengine: fix overlap stub / echocanceller

Flag: EXEMPT HOST_MODE
Bug: 420830022
Bug: 443166617
Test: build aosp_cf_x86_64_auto-trunk_staging-userdebug target
and check generated build artifacts CapSubsystem-CommonTypes.xml.
echo_canceller and stub shall have disting pos.

Signed-off-by: François Gaffie <francois.gaffie@ampere.cars>
(cherry picked from https://android-review.git.corp.google.com/c/platform/frameworks/av/+/3743670)
Change-Id: Idf48fbdadb635826b15bbd9da37fdc9a90c4bdad