power: qpnp-smbcharger: lower fcc by 200mA during SW ESR pulse

Currently the charger driver configures the fast charge current to 300mA
during a software ESR pulse. This is incorrect. FCC should be lowered by
a total delta of 200mA, not to 300mA.

Fix this in the charger driver.

CRs-Fixed: 872937
Change-Id: If7e8a52775d323f0b21d754a4322b85119b15ccc
Signed-off-by: Xiaozhe Shi <xiaozhes@codeaurora.org>