power: smb1390-psy: Configure IREV and main's ICL to prevent IREV condition

CP might enter IREV conditions in case of load attacks or when adapter
is configured for low output current(during taper). To prevent IREV
condition, configure CP IREV to 200mA and configure ICL of main charger
to 500mA when slave CP is disabled during taper.

Change-Id: I37be906a9d193e3f40cc5d1a1fec0777df14e6f8
Signed-off-by: Sahil Chandna <chandna@codeaurora.org>