Add user and group for sound_card_init

1. Adds a user and group for sound_card_init, which is currently
used to initialize the calibration value of smart amplifier during
boot time.
2. Add sound_card_init to audio group and cras group.

BUG=b:149437381
TEST=emerge-${BOARD} sound_card_init and verify that sound_card_init account
appear in /build/$BOARD/etc/{passwd,group}

Cq-Depend: chromium:2145748
Change-Id: I25990172dc2e87a79f66ab3142e7d0770a13dd2c
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/overlays/eclass-overlay/+/2064016
Tested-by: Judy Hsiao <judyhsiao@chromium.org>
Auto-Submit: Judy Hsiao <judyhsiao@chromium.org>
Commit-Queue: Judy Hsiao <judyhsiao@chromium.org>
Reviewed-by: Mike Frysinger <vapier@chromium.org>
4 files changed
tree: b73cfccb06ed18c2df7e6b77e9b7aec828d2c5e2
  1. OWNERS
  2. PRESUBMIT.cfg
  3. eclass/
  4. metadata/
  5. profiles/