rambi: Enable FW beep

Setup MAX98090 audio codec, configured over I2C and then fed audio over
I2S.

BUG=chrome-os-partner:24309
BRANCH=Rambi
TEST=Verify dev mode beep is heard on Rambi.

Change-Id: I6c0981ad502f93cd64bae74ee3889c7b0f032088
Reviewed-on: https://chromium-review.googlesource.com/185617
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Tested-by: Shawn Nematbakhsh <shawnn@chromium.org>
Commit-Queue: Shawn Nematbakhsh <shawnn@chromium.org>
2 files changed