common: Drop linux/printk.h from common header

This old patch was marked as deferred. Bring it back to life, to continue
towards the removal of common.h

Move this out of the common header and include it only where needed.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/board/synopsys/hsdk/env-lib.c b/board/synopsys/hsdk/env-lib.c
index fd54ac7..d85e816 100644
--- a/board/synopsys/hsdk/env-lib.c
+++ b/board/synopsys/hsdk/env-lib.c
@@ -7,6 +7,7 @@
 #include "env-lib.h"
 #include <env.h>
 #include <log.h>
+#include <linux/printk.h>
 
 #define MAX_CMD_LEN	25