clk:qcom: add mdss dsi and dp pll driver support

This snapshot adds mdss dsi and dp pll driver support for
different nm chipsets. Change includes updated licensing
required for 4.19. This snapshot was taken from msm-4.14
as of commit 5cc0f9c49e65 ("drivers: net: rmnet:
introduce rmnet traces").

Change-Id: Ic5a180f43836e672f0660c6a8f4a660dfc7cb74b
Signed-off-by: Samantha Tran <samtran@codeaurora.org>
Signed-off-by: Satya Rama Aditya Pinapala <psraditya30@codeaurora.org>