Gets max channel count from AudioSystem.java The FCC_LIMIT in the audio.h header might be different from the device on which the test is running. So instead grabbing the max channel count from AudioSystem.java, which will get the FCC_LIMIT of the current device. Test: Yes, this fixes a cts test Bug: 334122058 Change-Id: I0900ffb9bd449eea215d1f3cf4a4a7bb9b0e4735 Flag: EXEMPT bugfix