[M] Change in coreboot[master]: mb/google/rex: Enable audio BT offload

[Eric Lai (Code Review)]

Attention is currently required from: Tarun Tuli, Subrata Banik, Ravishankar Sarawadi, Kapil Porwal, Paul Menzel, Uday Bhat, Anil Kumar K, Jairaj Arava.

Eric Lai has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/72881 )

Change subject: mb/google/rex: Enable audio BT offload
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Patch Set 15:

(1 comment)

File src/mainboard/google/rex/variants/rex0/fw_config.c:

https://review.coreboot.org/c/coreboot/+/72881/comment/ed8e9e16_788a68cb 
PS15, Line 77: 	if (!fw_config_is_provisioned()) {
We can combine this into FW config probe. fw_config_probe will return false if provisioned, so you don't have to probe AUDIO_UNKNOWN as well. So we can do 
if (fw_config_probe(FW_CONFIG(AUDIO, MAX98363_CS42L42_SNDW))
else if (fw_config_probe(FW_CONFIG(AUDIO, MAX98360_ALC5682I_I2S))
else {
disable all
}