clk: uniphier: remove unneeded #include <linux/delay.h>

This include was needed to suppress build error when this driver
was initially merged because <linux/regmap.h> did not include
<linux/delay.h> at that time.  (developers' headache across
sub-systems)

The root cause has been fixed by commit adf08d48 ("regmap:
include <linux/delay.h> from include/linux/regmap.h"), so this
line can be dropped now.
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>

drivers/clk/uniphier/clk-uniphier-cpugear.c

@@ -14,7 +14,6 @@
  */
 
 #include <linux/clk-provider.h>
-#include <linux/delay.h>
 #include <linux/device.h>
 #include <linux/regmap.h>