audioeffect: add missing sources to deserializer config file

This CL adds fm_tuner and echo_reference in the list of allowed
input sources for default effect(s) instantiation.
XSD aligned accordingly.

Test: build
Bug: 136294538
Signed-off-by: Francois Gaffie <francois.gaffie@renault.com>

Change-Id: I0da109d637dac646ee43e2dd602ddfb0b21fa31d