clk: Add locking to clk_get_rate_range
clk_get_rate_range() is missing the proper locks, making lockdep
complain.
Signed-off-by: 
Maxime Ripard <maxime@cerno.tech>
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clk_get_rate_range() is missing the proper locks, making lockdep
complain.
Signed-off-by: Maxime Ripard <maxime@cerno.tech>