db410c: configs: increase gunzip buffer size for the kernel

the kernel fails to boot when it goes over the limit.

Signed-off-by: Jorge Ramirez-Ortiz <jorge.ramirez-ortiz@linaro.org>
diff --git a/include/configs/dragonboard410c.h b/include/configs/dragonboard410c.h
index d2447b2..3c5bb8a 100644
--- a/include/configs/dragonboard410c.h
+++ b/include/configs/dragonboard410c.h
@@ -23,7 +23,7 @@
 #define CONFIG_SYS_TEXT_BASE		0x80080000
 #define CONFIG_SYS_INIT_SP_ADDR		(CONFIG_SYS_SDRAM_BASE + 0x7fff0)
 #define CONFIG_SYS_LOAD_ADDR		(CONFIG_SYS_SDRAM_BASE + 0x80000)
-#define CONFIG_SYS_BOOTM_LEN		0x1000000 /* 16MB max kernel size */
+#define CONFIG_SYS_BOOTM_LEN		SZ_64M
 
 /* UART */