clk: Remove extraneous 'for' word in comments

An extra 'for' word is grammatically incorrect in the comment
'verifying ops for multi-parent clks'. This commit removes
this extra for word.

Signed-off-by: Rishi Gupta <gupt21@gmail.com>
Link: https://lkml.kernel.org/r/1566023759-7880-1-git-send-email-gupt21@gmail.com


Signed-off-by: Stephen Boyd <sboyd@kernel.org>