Try to fix thermal-engine dac_override denial.

We saw a similar denial on Marlin where thermal_engine was trying to
access /dev/diag.  This ports that fix to Wahoo to try to fix its
denial.

Bug: 78019417
Test: Build policy.
Change-Id: I3702e705ea4f99a58f4b96008d236d33ecd8045c
1 file changed