Add support for the display clock controller found in QCM2290
based devices. This clock controller feeds the Multimedia Display
SubSystem (MDSS).

It's a porting of dispcc-scuba GPL-2.0 driver from CAF msm-4.19 kernel:
https://source.codeaurora.org/quic/la/kernel/msm-4.19/tree/drivers/clk/qcom/dispcc-scuba.c?h=LE.UM.4.4.1.r3

Global clock name references (parent_names) have been replaced by
parent_data and parent_hws.

Clocks marked enable_safe_config have their clk_rcg2_ops moved to
clk_rcg2_shared_ops.
Signed-off-by: Loic Poulain <loic.poulain@linaro.org>
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Link: https://lore.kernel.org/r/1644432308-21099-2-git-send-email-loic.poulain@linaro.org