dt-bindings: qti-tri-led: Update reg definition

Commit f6ea1a19 ("ARM: dts: msm: add PMIC devices for Lahaina")
specifies the #address-cells and #size-cells of peripheral devices under
PMIC device nodes on the SPMI bus as 1 and 0 respectively. This requires
that the reg property specification of all child nodes of the PMIC
devices be updated.

Update qti-tri-led bindings accordingly.

Change-Id: Id529b45dd31b5c992282686b27da782df3746f5b