ARM: dts: msm: Add src clk name & control tags for sm8150

Add tag for src clk name for csiphy devices. The change
also adds debugfs tag for devices whose clock can be controlled
during run time.

Change-Id: I0689061fd10398ff1d55316a1c37b9c2cfc808a8
Signed-off-by: Karthik Anantha Ram <kartanan@codeaurora.org>