arm64: dts: msm8916: drop legacy suffix for clocks used by MSM DRM driver

Drop legacy suffix for clocks used by MSM DRM driver.

The _clk suffix has been deprecated since commit 20c3bb80235 ("drm/msm:
drop _clk suffix from clk names").

Fixes: 720c3bb8 (drm/msm: drop _clk suffix from clk names)

The following warnings during boot have been seen since the referenced
fixes commit:

msm_dsi_phy 1a98300.dsi-phy: Using legacy clk name binding.  Use "iface" instead of "iface_clk"
msm 1a00000.mdss: Using legacy clk name binding.  Use "iface" instead of "iface_clk"
msm 1a00000.mdss: Using legacy clk name binding.  Use "bus" instead of "bus_clk"
msm 1a00000.mdss: Using legacy clk name binding.  Use "vsync" instead of "vsync_clk"
msm_mdp 1a01000.mdp: Using legacy clk name binding.  Use "bus" instead of "bus_clk"
msm_mdp 1a01000.mdp: Using legacy clk name binding.  Use "iface" instead of "iface_clk"
msm_mdp 1a01000.mdp: Using legacy clk name binding.  Use "core" instead of "core_clk"
msm_mdp 1a01000.mdp: Using legacy clk name binding.  Use "vsync" instead of "vsync_clk"
msm_dsi 1a98000.dsi: Using legacy clk name binding.  Use "mdp_core" instead of "mdp_core_clk"
msm_dsi 1a98000.dsi: Using legacy clk name binding.  Use "iface" instead of "iface_clk"
msm_dsi 1a98000.dsi: Using legacy clk name binding.  Use "bus" instead of "bus_clk"
msm_dsi 1a98000.dsi: Using legacy clk name binding.  Use "byte" instead of "byte_clk"
msm_dsi 1a98000.dsi: Using legacy clk name binding.  Use "pixel" instead of "pixel_clk"
msm_dsi 1a98000.dsi: Using legacy clk name binding.  Use "core" instead of "core_clk"

Signed-off-by: Niklas Cassel <niklas.cassel@linaro.org>
Reviewed-by: Nicolas Dechesne <nicolas.dechesne@linaro.org>
Signed-off-by: Andy Gross <andy.gross@linaro.org>