power: qpnp-fg-gen3: Handle status change only after SOC is ready

Currently, SW can start handling status_change from other power
supplies viz. battery/parallel/usb as soon as the driver is
probed. But in some cases like device is booting up with the
charger connected, this can cause some of the SW algorithms not
to start correctly as the charging status got updated before they
are ready. Later when the algorithms are supposed to run, they
cannot start as the signal based on charging status is missed.

Fix this by skipping doing anything in status_change_work until
the profile_load_work is complete and schedule status_change_work
after profile_load_work is complete. While at it, start showing
50% if SOC is not ready.

CRs-Fixed: 2147343
Change-Id: Ib0a9f95d5a9a71f03d7a6c5f7ab36a8118a904ca
Signed-off-by: Subbaraman Narayanamurthy <subbaram@codeaurora.org>