power: smb5: Limit main charger's current for VBATT wls pl charging

When a wireless source is detected in VBATT output topology for dual
charge pumps, limit the main charger's share of the FCC to 1 A so that
the dual charge pumps can handle the rest.

Change-Id: I9e376862d72dd63ced7caf68f812ef6751ba4605
Signed-off-by: Guru Das Srinagesh <gurus@codeaurora.org>