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>

lib/panic.c

@@ -14,6 +14,7 @@
 #if !defined(CONFIG_PANIC_HANG)
 #include <command.h>
 #endif
+#include <linux/delay.h>
 
 static void panic_finish(void) __attribute__ ((noreturn));