arm64: dts: qcom: sdm845-oneplus: enable pmi8998 charger

Enable the pmi8998 charger on both devices, enabling charging speeds
above the default 500mA limit the bootloader sets.

Signed-off-by: Caleb Connolly <caleb.connolly@linaro.org>
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
Link: https://lore.kernel.org/r/20230524-pmi8998-charger-dts-v2-3-2a5c77d2ff0c@linaro.org