msm: clock-8960: Fix CSI pix and rdi clocks

The pix and rdi clocks are glitch free muxes without a root
enable before the mux. This requires both inputs to be clocking
before the mux can be switched, otherwise the mux will get stuck.
Create a new clock type for these clocks so we can properly
switch the mux selection.

Change-Id: I194c1545c397c06c1260b635738d37a3747e3800
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>