imx8qm_mek: Increase CONFIG_SYS_BOOTM_LEN to 64MB

The BSP platform LmP supports the board NXP iMX8QM MEK. 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/imx8qm_mek.h b/include/configs/imx8qm_mek.h
index 152fa6f..803daa4 100644
--- a/include/configs/imx8qm_mek.h
+++ b/include/configs/imx8qm_mek.h
@@ -10,6 +10,8 @@
 #include <linux/stringify.h>
 #include <asm/arch/imx-regs.h>
 
+#define CONFIG_SYS_BOOTM_LEN		(64 * SZ_1M)
+
 #ifdef CONFIG_SPL_BUILD
 #define CONFIG_SPL_MAX_SIZE				(124 * 1024)
 #define CONFIG_SYS_MONITOR_LEN				(1024 * 1024)