configs: ls1012a: Reduce CONFIG_ENV_SIZE to 0x2000

All LS1012A board variants have same CONFIG_ENV_SECT_SIZE and
CONFIG_ENV_SIZE values. If both config values are same, flash
environment cannot be saved. Since, CONFIG_ENV_SECT_SIZE needs to be
same as that of flash sector size, this entry cannot be changed.
Reduce CONFIG_ENV_SIZE value to 0x2000. This also helps in making config
value aligned with other boards environemt size.

Signed-off-by: Kuldeep Singh <kuldeep.singh@nxp.com>
Signed-off-by: Ashish Kumar <Ashish.kumar@nxp.com>
Reviewed-by: Priyanka Jain <priyanka.jain@nxp.com>
diff --git a/configs/ls1012ardb_qspi_defconfig b/configs/ls1012ardb_qspi_defconfig
index 92a364f..e39de4c 100644
--- a/configs/ls1012ardb_qspi_defconfig
+++ b/configs/ls1012ardb_qspi_defconfig
@@ -1,7 +1,7 @@
 CONFIG_ARM=y
 CONFIG_TARGET_LS1012ARDB=y
 CONFIG_SYS_TEXT_BASE=0x40100000
-CONFIG_ENV_SIZE=0x40000
+CONFIG_ENV_SIZE=0x2000
 CONFIG_ENV_OFFSET=0x300000
 CONFIG_ENV_SECT_SIZE=0x40000
 CONFIG_DM_GPIO=y