dt-bindings: thermal: qmi_sensor: Add MACROs for QMI sensors

Add MACROs to reference different QMI sensor indexes. This will help in
referencing the QMI sensor when defining a thermal zone.

Change-Id: I96d576d9d5eed91cb69279248e5536acb9ba5972
Signed-off-by: Ram Chandrasekar <rkumbako@codeaurora.org>