Add the missing `ANSWER_PHONE_CALL` to `PHONE_PERMISSIONS`

`ANSWER_PHONE_CALL` is a `PHONE` permission but is currently missing
from `PHONE_PERMISSIONS` in DPGP. This change fixes that to fix the
permission issue in Personal Safety app which holds PHONE permission
pregrant.

Flag: EXEMPT bugfix
Test: build
Bug: b/418068562
Change-Id: Ie1266fee539f3d568091dc977bd7b663e34b7d6d