power: qpnp-fg: fix address used for storing cc_soc coefficient

When capacity learning feedback is enabled, cc_to_soc
coefficient should get stored in SRAM register 0x578
as specified in the documentation. Fix it.

CRs-Fixed: 870383
Change-Id: Icd8e2770d7060e99388c845e991a2555bff4ba4d
Signed-off-by: Subbaraman Narayanamurthy <subbaram@codeaurora.org>