complete 'cgpt show' and refactor for incoming commands.

src/platform/vboot_reference/cgptlib/cgptlib.h

Index: src/platform/vboot_reference/cgptlib/cgptlib.h
diff --git a/src/platform/vboot_reference/cgptlib/cgptlib.h b/src/platform/vboot_reference/cgptlib/cgptlib.h
index af0774641bf93d3cbf8a00297add3109762b913d..7195ee7a666b9e32d6a7a8d3b0d7cc7883710eec 100644
--- a/src/platform/vboot_reference/cgptlib/cgptlib.h
+++ b/src/platform/vboot_reference/cgptlib/cgptlib.h
@@ -88,6 +88,9 @@ typedef struct {
                                   * 0x08 = table2  */
   int current_kernel; /* the current chromeos kernel index in partition table.
                        * -1 means not found on drive. */
+
+  /* Internal variables */
+  uint32_t valid_headers, valid_entries;
 } GptData;
 
 int GptInit(GptData *gpt);