qcom: battery: remove ICL_REDUCTION support

Make battery library to directly update the split current
of the main charger via power_supply framework's set_property
API using CURRENT_MAX property. ICL_REDUCTION property
is no longer required.

Note that we are not doing initial ICL vote for USBIN USBIN,
instead when time comes to split aicl, we will read the input
current limit and if nothing is set, check what the hw determined
as the max limit and use that.

For a PD charger case where the apsd result will be unknown,
the current limit is expected to be set by the time aicl settled is
called. The 30 second delaying of parallel enabling, should give
PD engine ample time to set the current limits.

While at it clean up the way settled current change is tracked. Create
a variable that specifically indicates the total settled current seen
last time settled current was adjusted. This makes compare to an updated
settled current value easy.

CRs-Fixed: 2014572
Change-Id: I040b65e6380f2c12350ea44bf32e6981ff126f18
Signed-off-by: Ashay Jaiswal <ashayj@codeaurora.org>
Signed-off-by: Abhijeet Dharmapurikar <adharmap@codeaurora.org>