control: JSON parsing compile framework

Add the enabling framework of use of JSON config files for fan control.

Tested:
    Compile passes when `--enable-json` configure flag given
    Compile passes without enabling JSON
    No functional change when not using JSON

Change-Id: Ic70bfc63ad74cb79559ed839784cd214df403cb2
Signed-off-by: Matthew Barth <msbarth@us.ibm.com>
6 files changed