power: qpnp-smbcharger: fix the FCC misconfiguration in parallel charging

Currently, when running the ESR SW workaround during parallel
charging, we configure the fast charge current (FCC) wrongly
to 100% whereas it should be configured to 50%. Fix it.

While at it, add a debug print when the parallel charger fast
charging current is reduced.

CRs-Fixed: 786898
Change-Id: Ief4d86c2e3b099581c2fbe374b847d0e7537813f
Signed-off-by: Subbaraman Narayanamurthy <subbaram@codeaurora.org>