common: Drop linux/delay.h from common header

Move this uncommon header out of the common header.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/drivers/power/regulator/tps65941_regulator.c b/drivers/power/regulator/tps65941_regulator.c
index 3f8be6c..150c72d 100644
--- a/drivers/power/regulator/tps65941_regulator.c
+++ b/drivers/power/regulator/tps65941_regulator.c
@@ -12,6 +12,7 @@
 #include <dm.h>
 #include <i2c.h>
 #include <log.h>
+#include <linux/delay.h>
 #include <power/pmic.h>
 #include <power/regulator.h>
 #include <power/tps65941.h>