arm64: dts: qcom: qcm6490-fairphone-fp5: Enable CCI pull-up

arm64: dts: qcom: qcm6490-fairphone-fp5: Enable CCI pull-up

Enable vreg_l6p, which is the voltage source for the pull-up resistor of
the CCI busses.

This ensures that I2C communication works as expected.

Reviewed-by: Bryan O'Donoghue <bod@kernel.org>
Reviewed-by: Konrad Dybcio <konrad.dybcio@oss.qualcomm.com>
Signed-off-by: Griffin Kroah-Hartman <griffin.kroah@fairphone.com>
Link: https://lore.kernel.org/r/20251016-dw9800-driver-v3-3-d7058f72ead4@fairphone.com
Signed-off-by: Bjorn Andersson <andersson@kernel.org>