Some platforms don't use the built-in charging hardware (e.g. milletwifi).
As this is an optional peripheral, default it to off.

Keep it enabled for all other boards that use smbb.
Signed-off-by: Bryant Mairs <bryant@mai.rs>
Signed-off-by: Luca Weiss <luca@z3ntu.xyz>
Acked-by: Konrad Dybcio <konrad.dybcio@linaro.org>
Link: https://lore.kernel.org/r/20231203-smbb-pm8941-pm8226-v1-1-9ad75909604b@z3ntu.xyzSigned-off-by: Bjorn Andersson <andersson@kernel.org>