clkdev: Move clk creation outside of 'clocks_mutex'

We don't need to hold the 'clocks_mutex' here when we're creating a clk
pointer from a clk_lookup structure. Instead, we just need to make sure
that the lookup doesn't go away while we dereference the lookup pointer
to extract the clk_hw pointer out of it. Let's move things around
slightly so that we have a new function to get the clk_hw out of the
lookup with the right locking and then chain the two together for what
used to be __clk_get_sys().

Cc: Miquel Raynal <[email protected]>
Cc: Jerome Brunet <[email protected]>
Cc: Russell King <[email protected]>
Cc: Michael Turquette <[email protected]>
Cc: Jeffrey Hugo <[email protected]>
Cc: Chen-Yu Tsai <[email protected]>
Tested-by: Jeffrey Hugo <[email protected]>
Signed-off-by: Stephen Boyd <[email protected]>

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