clk: Remove never used devm_clk_*unregister()

clk: Remove never used devm_clk_*unregister()

For the entire history of the devm_clk_*unregister() existence they were
used only once (*) in 2015. Remove them.

*) The commit 3909c7958039 ("clk: s2mps11: Simplify s2mps11_clk_probe unwind
   paths") exactly supports the point of the change proposed here.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Link: https://lore.kernel.org/r/20220622171147.85603-1-andriy.shevchenko@linux.intel.com
Acked-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Stephen Boyd <sboyd@kernel.org>