dt-bindings: update dynamic clock switch feature nodes

Change adds dynamic clock switch feature enabling node
"qcom,dsi-dyn-clk-enable", list of all dynamic clocks
supported "qcom,dsi-dyn-clk-list" and node
subtype with"qcom,dsi-dyn-clk-type".

Change-Id: I1b6bc19e502e2d7019da5f569a830c3e05ac82a3