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/include/ext4fs.h b/include/ext4fs.h
index 34585d4..aafcd84 100644
--- a/include/ext4fs.h
+++ b/include/ext4fs.h
@@ -152,11 +152,11 @@
 int ext4fs_size(const char *filename, loff_t *size);
 void ext4fs_free_node(struct ext2fs_node *node, struct ext2fs_node *currroot);
 int ext4fs_devread(lbaint_t sector, int byte_offset, int byte_len, char *buf);
-void ext4fs_set_blk_dev(struct blk_desc *rbdd, disk_partition_t *info);
+void ext4fs_set_blk_dev(struct blk_desc *rbdd, struct disk_partition *info);
 long int read_allocated_block(struct ext2_inode *inode, int fileblock,
 			      struct ext_block_cache *cache);
 int ext4fs_probe(struct blk_desc *fs_dev_desc,
-		 disk_partition_t *fs_partition);
+		 struct disk_partition *fs_partition);
 int ext4_read_file(const char *filename, void *buf, loff_t offset, loff_t len,
 		   loff_t *actread);
 int ext4_read_superblock(char *buffer);