Add exit air temp sensor

Exit air temperature is calculated based on system
power and CFM. CFM sensor will be broken out into own
sensor in follow on commit.

Change-Id: I01b68c4de9a17e5a8d623bbbd7e7089f8f9d15d5
Signed-off-by: James Feist <james.feist@linux.intel.com>
4 files changed