clk: bcm: rpi: Create helper to retrieve private data

The RaspberryPi firmware clocks driver uses in several instances a
container_of to retrieve the struct raspberrypi_clk_data from a pointer
to struct clk_hw. Let's create a small function to avoid duplicating it
all over the place.

Acked-by: Stephen Boyd <[email protected]>
Signed-off-by: Maxime Ripard <[email protected]>
Signed-off-by: Dave Stevenson <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Reviewed-by: Florian Fainelli <[email protected]>
Signed-off-by: Stephen Boyd <[email protected]>

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