power: qpnp-fg: fine tune monotonic and resume SOC

Currently the fuel gauge driver only allows resume SOCs of 0-100.
However, the fuel gauge hardware allows for higher accuracy resume SOCs
of 0-255. Support this in the driver by adding the resume-soc-raw
property.

Also, fine tune the reported SOC. 0% SOC should only be reported when
the SOC is 0, and 100% SOC should only be reported when the SOC is full.

Change the report function to reflect this.

CRs-Fixed: 857620, 844543
Change-Id: Ib7513bf5c53c94cbb655eb0934472e912bc3f805
Signed-off-by: Xiaozhe Shi <xiaozhes@codeaurora.org>