ARM: dts: msm: Add BCL sensors for pm855l

Add BCL vph sensor for pm855l. This sensor will be used by thermal
framework to monitor and mitigate lower battery voltage condition.

Change-Id: Icf25109a015951d875d67ba05cadc9cc293a9425
Signed-off-by: Ram Chandrasekar <rkumbako@codeaurora.org>