ARM: dts: msm: Add support for bcl on 8084

BCL is used to detect high battery current situations and react
to it by lowering cpu frequencies.
Battery Current can be read via ADC - mpp6 line and the ADC
BTM block is configured to do periodic reads on it.

Change-Id: I7843a284d015afeed8cb705d4c216188eaba6b99
Signed-off-by: Abhijeet Dharmapurikar <adharmap@codeaurora.org>