Fix common misspellings

Fixes generated by 'codespell' and manually reviewed.

Signed-off-by: Lucas De Marchi <lucas.demarchi@profusion.mobi>
diff --git a/drivers/mtd/nand/sm_common.c b/drivers/mtd/nand/sm_common.c
index 4a8f367..57cc80c 100644
--- a/drivers/mtd/nand/sm_common.c
+++ b/drivers/mtd/nand/sm_common.c
@@ -121,7 +121,7 @@
 	if (ret)
 		return ret;
 
-	/* Bad block marker postion */
+	/* Bad block marker position */
 	chip->badblockpos = 0x05;
 	chip->badblockbits = 7;
 	chip->block_markbad = sm_block_markbad;