clk: qcom: mmcc-msm8960: handle LVDS clock

clk: qcom: mmcc-msm8960: handle LVDS clock

On APQ8064 the DSI2_PIXEL_SRC clock can be used either to drive the
second DSI host or to drive the LCDC controller. Add LVDS PLL as
possible source to the clock and LVDS output clock. The DSI2_PIXEL_SRC
clock has separate path to be used for the LVDS clock.  To represent
both DSI and LVDS clocks properly, add intermediate clock which toggles
the enable bit and make DSI2_PIXEL_CLK clock just check for the HALT
bit.

Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Link: https://lore.kernel.org/r/20241224-apq8064-fix-mmcc-v1-4-c95d2e2bf143@linaro.org
Signed-off-by: Bjorn Andersson <andersson@kernel.org>