Try all PCM formats for loopback latency test.

When opening mmap stream, the framework may only select the first
possible configuration if the requsted configuration doesn't match
exactly to any possible configurations. In that case, the test should
try all formats to make sure all possible configurations are tested to
get the correct and best result.

Bug: 407643937
Test: run the test
Flag: TEST_ONLY
Change-Id: Id9313bba011456dde48a7611cc847929115ee851
4 files changed