mfd: pm8038: add ccadc cell

The 8038 has a ccadc (coulumb counter analog to digital converter) which
is used by the BMS for state of charge (SOC) reporting and is also used by
software to get instantaneous battery current. Without this cell the ccadc
is never probed and current readings and SOC are inaccurate.

CRs-Fixed: 372679
Change-Id: If323a35dda650067219f35e68395f9fd23f4d69b
Signed-off-by: Abhijeet Dharmapurikar <adharmap@codeaurora.org>