qpnp-fg-gen3: show 0 time to full at 100% SOC

Currently the time to full is clamped to 0 when the charge status
reports full, but the full status is reported minutes after the SOC
reaches 100%. Furthermore, the CC estimates use SOC as a scaling
mechanism so using full status is inconsistent. Clamp the time to full
estimate to 0 when the SOC reaches 100% instead.

Change-Id: I71e3e0f0cddf3b75ae5e711c86df26fc6a79957d
Signed-off-by: Nicholas Troast <ntroast@codeaurora.org>