thermal: qpnp-adc-tm: Add read_status function for non-HC peripheral

SW variables updated are different for HC and non-HC peripherals.
Add read_status function for non-HC peripheral to ensure proper
functioning of non-HC peripheral.

Change-Id: I481c11674cf3e407ef731ba159e7056517889569
Signed-off-by: Jishnu Prakash <jprakash@codeaurora.org>