imx8mq_evk: Increase CONFIG_SYS_BOOTM_LEN to 64MB

The BSP platform LmP supports the board NXP iMX8M Plus EVK. The
kernel size in LmP exceeds 32Mb. Increase the maximum size
of an uncompressed kernel to fix the following error:
    Uncompressing Kernel Image
    Error: inflate() returned -5
    Image too large: increase CONFIG_SYS_BOOTM_LEN
    Must RESET board to recover

Signed-off-by: Oleksandr Suvorov <oleksandr.suvorov@foundries.io>
diff --git a/include/configs/imx8mq_evk.h b/include/configs/imx8mq_evk.h
index 9b9d6fd..f2eb777 100644
--- a/include/configs/imx8mq_evk.h
+++ b/include/configs/imx8mq_evk.h
@@ -10,7 +10,7 @@
 #include <linux/stringify.h>
 #include <asm/arch/imx-regs.h>
 
-#define CONFIG_SYS_BOOTM_LEN		(32 * SZ_1M)
+#define CONFIG_SYS_BOOTM_LEN		(64 * SZ_1M)
 
 #define CONFIG_SPL_MAX_SIZE		(124 * 1024)
 #define CONFIG_SYS_MONITOR_LEN		(512 * 1024)