I have found several topics with connecting ONE SPH0645 mic to J41, but never seen how to connect TWO mics to J41.
So I suppose following:
DOUT.0 and DOUT.1 are connected together,
SEL.0 - 3.v - first half of i2s frame,
SEL.1 - GND - second half of i2s frame,
is it right?