part: Drop disk_partition_t typedef

We should not be using typedefs and these make it harder to use
forward declarations (to reduce header file inclusions). Drop the typedef.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/cmd/zfs.c b/cmd/zfs.c
index 9c237a5..2b622a8 100644
--- a/cmd/zfs.c
+++ b/cmd/zfs.c
@@ -38,7 +38,7 @@
 	int dev;
 	int part;
 	ulong addr = 0;
-	disk_partition_t info;
+	struct disk_partition info;
 	struct blk_desc *dev_desc;
 	unsigned long count;
 	const char *addr_str;
@@ -135,7 +135,7 @@
 	const char *filename = "/";
 	int part;
 	struct blk_desc *dev_desc;
-	disk_partition_t info;
+	struct disk_partition info;
 	struct device_s vdev;
 
 	if (argc < 2)