power: battery: smb1390-charger-psy: Handle CP(s) disable conditions

Add support to disable charge pump(s) when FCC or ILIM falls below its
specified threshold.
Once slave charge pump is disabled, redistribute the ILIM to master charge
pump.

Change-Id: I3f23933185e518fa5d66df4eb37b49715d453737
Signed-off-by: Sahil Chandna <chandna@codeaurora.org>