Revert "fs: fat: assign rootdir sector when accessing root directory"

This particular commit is causing a regression on stih410-b2260 and
other platforms when reading from FAT16.  Noting that I had rebased the
original fix from Thomas onto then-current master, there is also
question from Akashi-san if the change is still needed after other FAT
fixes that have gone in.

This reverts commit a68b0e11ea774492713a65d9fd5bb525fcaefff3.

Reported-by: Patrice Chotard <patrice.chotard@st.com>
Cc: AKASHI Takahiro <takahiro.akashi@linaro.org>
Cc: Thomas RIENOESSL <thomas.rienoessl@bachmann.info>
Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/fs/fat/fat.c b/fs/fat/fat.c
index ac8913e..179bf4f 100644
--- a/fs/fat/fat.c
+++ b/fs/fat/fat.c
@@ -736,10 +736,7 @@
 	if (itr->last_cluster)
 		return NULL;
 
-	if (itr->fsdata->fatsize != 32 && itr->is_root)
-		sect = mydata->rootdir_sect;
-	else
-		sect = clust_to_sect(itr->fsdata, itr->next_clust);
+	sect = clust_to_sect(itr->fsdata, itr->next_clust);
 
 	debug("FAT read(sect=%d), clust_size=%d, DIRENTSPERBLOCK=%zd\n",
 	      sect, itr->fsdata->clust_size, DIRENTSPERBLOCK);