mmc: bring back partition init for non-DM MMC drivers

Commit d0851c893706 ("blk: Call part_init() in the post_probe() method")
removed the call to part_init() in mmc.c, as this is done by the DM_MMC
framework.
However Allwinner is (still) relying on a non-DM MMC driver, so we are
now missing the implicit partition init, leading to failing MMC accesses
due to the missing partition information.

Bring the call back just for non-DM MMC driver to fix this regression.

Signed-off-by: Andre Przywara <andre.przywara@arm.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
Tested-by: Soeren Moch <smoch@web.de>
diff --git a/drivers/mmc/mmc.c b/drivers/mmc/mmc.c
index f5c821e..d858127 100644
--- a/drivers/mmc/mmc.c
+++ b/drivers/mmc/mmc.c
@@ -2449,6 +2449,10 @@
 	bdesc->revision[0] = 0;
 #endif
 
+#if !defined(CONFIG_DM_MMC) && (!defined(CONFIG_SPL_BUILD) || defined(CONFIG_SPL_LIBDISK_SUPPORT))
+	part_init(bdesc);
+#endif
+
 	return 0;
 }