lx2162a : Rename emmc boot command variable

Rename emmc_bootcmd environment variable to sd2_bootcmd
to fix emmc boot on lx2162aqds board.

Signed-off-by: Meenakshi Aggarwal <meenakshi.aggarwal@nxp.com>
Reviewed-by: Priyanka Jain <priyanka.jain@nxp.com>
diff --git a/include/configs/lx2162aqds.h b/include/configs/lx2162aqds.h
index 7fa3c25..f1b4e1c 100644
--- a/include/configs/lx2162aqds.h
+++ b/include/configs/lx2162aqds.h
@@ -1,6 +1,6 @@
 /* SPDX-License-Identifier: GPL-2.0+ */
 /*
- * Copyright 2020 NXP
+ * Copyright 2020-2021 NXP
  */
 
 #ifndef __LX2162_QDS_H
@@ -60,7 +60,7 @@
 		"$kernelhdr_addr_sd $kernelhdr_size_sd "	\
 		" && esbc_validate ${kernelheader_addr_r};"	\
 		"bootm $load_addr#$BOARD\0"			\
-	"emmc_bootcmd=echo Trying load from emmc card..;"	\
+	"sd2_bootcmd=echo Trying load from emmc card..;"	\
 		"mmc dev 1; mmcinfo; mmc read $load_addr "	\
 		"$kernel_addr_sd $kernel_size_sd ;"		\
 		"env exists secureboot && mmc read $kernelheader_addr_r "\