charger: vendor charger use resources from /vendor

For the vendor variant of libhealthd_mode_charger, read resources
from /vendor. The core variant continues to read resources from
/product, /system, and /res.

Test: run charger from /vendor manually
Bug: 203246116
Change-Id: Ia9df1d081a51783409b5dbd3e3d4719efc3cb6a7
2 files changed