zdump/dfi: Extract dfi_vmcoreinfo.h header from dfi.h

Create a separate C header for DFI VMCOREINFO to separate
independent things and make it more readable.

Signed-off-by: Alexander Egorenkov <egorenar@linux.ibm.com>
Signed-off-by: Jan Höppner <hoeppner@linux.ibm.com>

zdump/dfi.c

@@ -12,8 +12,10 @@
 #include <time.h>
 
 #include "lib/util_log.h"
+
 #include "zgetdump.h"
 #include "dfi_mem_chunk.h"
+#include "dfi_vmcoreinfo.h"
 
 #define TIME_FMT_STR "%a, %d %b %Y %H:%M:%S %z"
 #define PROGRESS_HASH_CNT 50