Add Chris as maintainer

I would like to help out on the reviews. I have been reviewing
occ-control code for over a year and I am ready to share some of the
maintanence burden going forward.

Here are my contributions to occ-control repository:
https://github.com/openbmc/openpower-occ-control/commits?author=cjcain

Change-Id: I4cb1d30ae6b9e7ce0eb2bebbbf156558245f93d4
Signed-off-by: Chris Cain <cjcain@us.ibm.com>
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