power: qpnp-fg-gen3: fix SRAM encodings

power: qpnp-fg-gen3: fix SRAM encodings

There are some encoding changes to the following configurations
in pmi8998 SRAM. Update them.

For both v1.1 and v2.0,
- No sign bit for charge termination current

For v2.0,
- 6 bit encoding for empty voltage and vbatt_low

While at it, fix the SRAM byte location from byte 2 to byte 3 for
configuring empty voltage threshold in pmi8998v2.0.

CRs-Fixed: 1068592
Change-Id: I3a301aed1b23ab78aa86b24c11eb750502adab2f
Signed-off-by: Subbaraman Narayanamurthy <subbaram@codeaurora.org>