Move default multihal configuration file to /vendor/...

Move default multihal configuration file path to
/vendor/etc/sensors/hals.conf. Retained old definition but changed
varible name to mark it deprecated. get_so_paths() is modified
to search both new and old path for configuration file.

MULTI_HAL_CONFIG_FILE_PATH is only used by hidl default
implementation at this moment outside multihal module.

Bug: 35947802
Test: build ok, sensor works on 2017 devices
Change-Id: I443ff71fa194383646108c8eb0c5438d150a5886
2 files changed