power: qpnp-fg-gen4: Fix encoding for Rconn

Bit encoding for ESR and Rconn are different. However, currently
the ESR encoding is used for encoding the Rconn value also.
Due to this the incorrect Rconn value is stored in the SRAM and
leads to a premature charge termination.Fix it by adding a
separate encoding rule for Rconn.

Change-Id: I902a8316595f11d8d4b10f25d3ace57a71840d14
Signed-off-by: Kiran Gunda <kgunda@codeaurora.org>