GPT: read partition table from device into a data structure

Make the partition table available for modification by reading it from
the user-specified device into a linked list.   Provide an accessor
function for command-line testing.

Signed-off-by: Alison Chaiken <alison@peloton-tech.com>
[trini: Make this depend on CMD_GPT_RENAME, as it is the user of this
code]
Signed-off-by: Tom Rini <trini@konsulko.com>

include/part.h

@@ -10,6 +10,7 @@
 #include <blk.h>
 #include <ide.h>
 #include <uuid.h>
+#include <linux/list.h>
 
 struct block_drvr {
 	char *name;
@@ -69,6 +70,12 @@ typedef struct disk_partition {
 #endif
 } disk_partition_t;
 
+struct disk_part {
+	int partnum;
+	disk_partition_t gpt_part_info;
+	struct list_head list;
+};
+
 /* Misc _get_dev functions */
 #ifdef CONFIG_PARTITIONS
 /**