Add 5.1.2, 5.1.4, 7.1.2, 7.1.4 output channel masks

They were supposed to be added by the change with id
I2f488462614114e4c82149460b030585981ae15e
but actually were not.

Bug: 38184704
Bug: 63901775
Test: make
Change-Id: I66c465fb5a06712949d1e1759064bab1de2e219d