arm64: dts: qcom: sdm630-nile: Enable and configure PM660L WLED

arm64: dts: qcom: sdm630-nile: Enable and configure PM660L WLED

The board-specific (electrical) configuration was removed from PM660L in
90ba636e40cb ("arm64: dts: qcom: pm660l: Remove board-specific WLED
configuration") as it is platform-dependent.  We reintroduce it here in
the Nile board configuration (with a slightly lower current limit, as
per downstream DT sources) and enable it for use in the dsi0 node.

Signed-off-by: Marijn Suijten <marijn.suijten@somainline.org>
Link: https://lore.kernel.org/r/20240204-sdm630-nile-wled-v1-1-9f5c4f8147f2@somainline.org
Signed-off-by: Bjorn Andersson <andersson@kernel.org>