arm64: dts: qcom: pm8350c: Add flash led node

Add a node for the led controller found on PM8350C, used for flash and
torch purposes.

Signed-off-by: Luca Weiss <luca.weiss@fairphone.com>
Link: https://lore.kernel.org/r/20230919-fp5-initial-v2-4-14bb7cedadf5@fairphone.com


Signed-off-by: Bjorn Andersson <andersson@kernel.org>