qcom: qnovo: Disable ok_to_qnovo right after charging stops

Disable ok_to_qnovo immediately after charging is disabled while pulse
train is in progress. The flag property ok_to_qnovo indicates qnovno
charging readiness, A delay in doing so could make a normal charging
stop mistakenly treated as an error.

Change-Id: If0c43a4e05b2e0f8cc0ce9a9edca15f466c7fbff
Signed-off-by: Harry Yang <harryy@codeaurora.org>