Refactor default values in VHAL

Move default values closer to config declration to add properties
with less pain in future.

Test: mm -j32; verified if Car Service works

(cherry picked from commit 24ade175)
Merged-In: I2f18837658149eb657f44d81e34eb8e6e497a25c
Change-Id: Ie4285581fa9d871b366b0ed2f08fa8073739a0a9