imx8m: enlarge CONFIG_SYS_BOOTM_LEN

Enlarge CONFIG_SYS_BOOTM_LEN when booting FIT image with AArch32 mode
Linux kernel.

Signed-off-by: Peng Fan <peng.fan@nxp.com>
diff --git a/include/configs/imx8mq_evk.h b/include/configs/imx8mq_evk.h
index 3665778..c0eaf59 100644
--- a/include/configs/imx8mq_evk.h
+++ b/include/configs/imx8mq_evk.h
@@ -10,6 +10,8 @@
 #include <linux/stringify.h>
 #include <asm/arch/imx-regs.h>
 
+#define CONFIG_SYS_BOOTM_LEN		(32 * SZ_1M)
+
 #define CONFIG_SPL_MAX_SIZE		(124 * 1024)
 #define CONFIG_SYS_MONITOR_LEN		(512 * 1024)
 #define CONFIG_SYS_MMCSD_RAW_MODE_U_BOOT_USE_SECTOR