typecd: Add typecd_ec group and user

Add the typecd_ec group and user  (and ensure that cros_ec-access is
created) so that debugd EC Type C tool can access /dev/cros_ec.

TEST=Build an image with the updated debugd and typecd. Ensure that
the debugd D-BUS command returns the inventory list. Command is:
'dbus-send --system --dest=org.chromium.debugd --print-reply
/org/chromium/debugd org.chromium.debugd.EcGetInventoryGetInventory'

Change-Id: I2dc80fb4850fea1202ea907de66c8ab12fd9d084
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/overlays/chromiumos-overlay/+/2591798
Tested-by: Prashant Malani <pmalani@chromium.org>
Reviewed-by: Alex Klein <saklein@chromium.org>
Commit-Queue: Prashant Malani <pmalani@chromium.org>
1 file changed