clk: add api to get clk consumer from clk_hw

clk_register() is deprecated. Using 'clk' member of struct clk_hw is
discouraged. With this constraint, it is difficult for driver to
register clocks using the clk_hw API and then use the clock with
the consumer API

This adds a simple helper, clk_hw_get_clk(), to get a struct clk from
a struct clk_hw. Like other clk_get() variant, each call to this helper
must be balanced with a call to clk_put(). To make life easier on the
consumers, a memory managed version is provided as well.

Cc: Martin Blumenstingl <[email protected]>
Signed-off-by: Jerome Brunet <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Tested-by: Kevin Hilman <[email protected]>
[[email protected]: Fix kernel-doc]
Signed-off-by: Stephen Boyd <[email protected]>

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