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/phy/meson-g12a-usb2.c b/drivers/phy/meson-g12a-usb2.c
index 6030031..a1e6219 100644
--- a/drivers/phy/meson-g12a-usb2.c
+++ b/drivers/phy/meson-g12a-usb2.c
@@ -16,6 +16,7 @@
 #include <errno.h>
 #include <generic-phy.h>
 #include <regmap.h>
+#include <linux/delay.h>
 #include <power/regulator.h>
 #include <reset.h>
 #include <clk.h>