ARM: dts: msm: Add dummy NPU clocks support on SDM855

Add the clock device tree node for npucc. Also add the header file
with all the clock references for clients to use.

Change-Id: I293465e1f785c2f920a1beb922a2ce5389a2eb42
Signed-off-by: Deepak Katragadda <dkatraga@codeaurora.org>