common: Move testdram() into init.h

This function is called during init so move it to the init header file.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/board/cobra5272/cobra5272.c b/board/cobra5272/cobra5272.c
index a0a416b5..a79884c 100644
--- a/board/cobra5272/cobra5272.c
+++ b/board/cobra5272/cobra5272.c
@@ -5,6 +5,7 @@
  */
 
 #include <common.h>
+#include <init.h>
 #include <asm/immap.h>
 
 DECLARE_GLOBAL_DATA_PTR;
@@ -31,7 +32,7 @@
 	return 0;
 };
 
-int testdram (void)
+int testdram(void)
 {
 	/* TODO: XXX XXX XXX */
 	printf ("DRAM test not implemented!\n");