Making updates to driver_internal_info can result in hard to read code
due the requirement to assign the whole driver_internal_info back to
the node to trigger the expected update operation. This change
replaces driver_internal_info update operations with a new
methods:
- set_driver_internal_info
- del_driver_internal_info
- timestamp_driver_internal_info
This change defines the functions and moves core conductor logic to
use them. Subsequent changes in this series will move drivers to use
the new functions.
Change-Id: Ib8917c3c674e77cd3aba6a1e73c65162e3ee1141