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/arch/arm/mach-sunxi/spl_spi_sunxi.c b/arch/arm/mach-sunxi/spl_spi_sunxi.c
index c084de7..d369df9 100644
--- a/arch/arm/mach-sunxi/spl_spi_sunxi.c
+++ b/arch/arm/mach-sunxi/spl_spi_sunxi.c
@@ -9,6 +9,7 @@
 #include <spl.h>
 #include <asm/gpio.h>
 #include <asm/io.h>
+#include <linux/delay.h>
 #include <linux/libfdt.h>
 
 #ifdef CONFIG_SPL_OS_BOOT