fg: bms_charge_full contains an incorrect value.

bms_charge_full is recalculated after full charging cycles,
but it contains an incorrect value.
because the int type calculates overflow.

Change-Id: Ia61af9893d4588dfce9cd50c656a6194ce8a464b
Signed-off-by: xiewen3 <xiewen3@motorola.com>
Reviewed-on: https://gerrit.mot.com/990132


SME-Granted: SME Approvals Granted
SLTApproved: Slta Waiver <sltawvr@motorola.com>
Tested-by: Jira Key <jirakey@motorola.com>
Reviewed-by: Haijian Ma <mahj8@lenovo.com>
Reviewed-by: Lu Chai <chailu1@motorola.com>
Reviewed-by: Yonghua Yan <yanyh2@motorola.com>
Reviewed-by: Xiangpo Zhao <zhaoxp3@motorola.com>
Submit-Approved: Jira Key <jirakey@motorola.com>

Signed-off-by: zachariasmaladroit <zacharias.maladroit@gmail.com>
(cherry picked from commit d2797c36648f7136b74520866411cb53da5f2bd1)