regulator: cpr3-regulator: conditionally enable thread aggregation for CPRh

Enable CPR hardware thread aggregation for CPRh controllers which
manage more than one thread.  This ensures that CPR closed-loop
operation acts upon the up or down recommendation from each
CPR sensor measurement.

Change-Id: I30f74c6f22133358aa316933d2bf83f5b0b8af9c
Signed-off-by: David Collins <collinsd@codeaurora.org>