dt-bindings: clk: qcom: drop the SC7180 Modem subsystem clock controller

This clock controller has never been used in the DT files merged to the
kernel. According to Sibi, it only worked on the pre-production devices.
For the production devices this functionality has been moved to the
firmware.

Drop the bindings now after dropping the driver itself.

Cc: Sibi Sankar <[email protected]>
Signed-off-by: Dmitry Baryshkov <[email protected]>
Reviewed-by: Krzysztof Kozlowski <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Bjorn Andersson <[email protected]>

Author: lumag