power: qpnp-fg: Add SOC_REPORTING_READY to indicate actual SOC reporting

Before battery profile has been loaded, FG reports a default capacity
instead of the actual battery capacity. Add SOC_REPORTING_READY to
indicate if the actual battery capacity is ready.

CRs-Fixed: 1001496
Change-Id: If6cdbc2b5d413e7f2a5c664b2909059afa4dbd44
Signed-off-by: Fenglin Wu <fenglinw@codeaurora.org>