Fix channel mask for the EARPIECE in example APM config

EARPIECE is an output device, must have an output channel
mask.

Bug: 142480271
Test: N/A
Change-Id: I676bc7222474f2d366bfb4edcd14b83381d68083
Merged-In: I676bc7222474f2d366bfb4edcd14b83381d68083
2 files changed