mtd: rawnand: fsl_elbc: Implement RNDOUT command

This is needed for SW ECC.

Signed-off-by: Pali Rohár <pali@kernel.org>
Reviewed-by: Priyanka Jain <priyanka.jain@nxp.com>
diff --git a/drivers/mtd/nand/raw/fsl_elbc_nand.c b/drivers/mtd/nand/raw/fsl_elbc_nand.c
index ddfd75d..f8698ec 100644
--- a/drivers/mtd/nand/raw/fsl_elbc_nand.c
+++ b/drivers/mtd/nand/raw/fsl_elbc_nand.c
@@ -312,6 +312,14 @@
 		fsl_elbc_run_command(mtd);
 		return;
 
+	/* RNDOUT moves the pointer inside the page */
+	case NAND_CMD_RNDOUT:
+		vdbg("fsl_elbc_cmdfunc: NAND_CMD_RNDOUT, column: 0x%x.\n",
+		     column);
+
+		ctrl->index = column;
+		return;
+
 	/* READOOB reads only the OOB because no ECC is performed. */
 	case NAND_CMD_READOOB:
 		vdbg("fsl_elbc_cmdfunc: NAND_CMD_READOOB, page_addr:"