clk: <linux/clk-provider.h>: drop a duplicated word

Drop the repeated word "not" in a comment.
Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
Cc: Michael Turquette <mturquette@baylibre.com>
Cc: Stephen Boyd <sboyd@kernel.org>
Cc: linux-clk@vger.kernel.org
Link: https://lore.kernel.org/r/20200719002830.20319-1-rdunlap@infradead.orgSigned-off-by: Stephen Boyd <sboyd@kernel.org>

include/linux/clk-provider.h

@@ -189,7 +189,7 @@ struct clk_duty {
  *              and >= numerator) Return 0 on success, otherwise -EERROR.
  *
  * @init:	Perform platform-specific initialization magic.
- *		This is not not used by any of the basic clock types.
+ *		This is not used by any of the basic clock types.
  *		This callback exist for HW which needs to perform some
  *		initialisation magic for CCF to get an accurate view of the
  *		clock. It may also be used dynamic resource allocation is