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>

board/st/common/stm32mp_dfu.c

@@ -17,7 +17,7 @@
 
 static void board_get_alt_info_mmc(struct udevice *dev, char *buf)
 {
-	disk_partition_t info;
+	struct disk_partition info;
 	int p, len, devnum;
 	bool first = true;
 	const char *name;