healthd use vintf_fragments

This encourages device manufacturers to use
service.override over service and to remove healthd
on device, because it is one less step to do.

Test: make VINTF metadata
Bug: 66917623
Change-Id: Ibc3af4a4eec1e94c15c2ee21c577c4090a3a7a1c
Merged-In: Ibc3af4a4eec1e94c15c2ee21c577c4090a3a7a1c
(cherry picked from commit 824e293951669d009e3ec481001eb062cbab9b8f)
2 files changed