arm64: dts: qcom: pmi8994: Remove hardcoded linear WLED enabled-strings

The driver now sets an appropriate default for WLED4 (and WLED5) just
like WLED3 making this linear array from 0-3 redundant.  In addition the
driver is now able to parse arrays of variable length solving the "all
four strings *have to* be defined" comment.

Besides the driver will now warn when both properties are specified to
prevent ambiguity: the length of the array is enough to imply a set
number of strings.
Signed-off-by: Marijn Suijten <marijn.suijten@somainline.org>
Reviewed-By: AngeloGioacchino Del Regno <angelogioacchino.delregno@somainline.org>
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Link: https://lore.kernel.org/r/20211007213400.258371-12-marijn.suijten@somainline.org

arch/arm64/boot/dts/qcom/pmi8994.dtsi

@@ -39,8 +39,6 @@ pmi8994_wled: wled@d800 {
 			interrupts = <3 0xd8 0x02 IRQ_TYPE_EDGE_RISING>;
 			interrupt-names = "short";
 			qcom,num-strings = <3>;
-			/* Yes, all four strings *have to* be defined or things won't work. */
-			qcom,enabled-strings = <0 1 2 3>;
 			qcom,cabc;
 			qcom,external-pfet;
 			status = "disabled";