arm64: dts: qcom: sm7225-fairphone-fp4: configure flash LED

Configure the pm6150l flash node for the dual flash LEDs found on FP4.

Signed-off-by: Luca Weiss <luca.weiss@fairphone.com>
Reviewed-by: Konrad Dybcio <konrad.dybcio@linaro.org>
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
Link: https://lore.kernel.org/r/20221209-fp4-pm6150l-flash-v1-3-531521eb2a72@fairphone.com