configs: meson64_android: increase SYS_MALLOC_LEN to 128M for AVB

To prepare for AVB support, increase SYS_MALLOC_LEN to 128M.
This value has been found by testing the following on khadas vim3l:
  => avb init
  => avb verify

Signed-off-by: Mattijs Korpershoek <mkorpershoek@baylibre.com>
Acked-by: Neil Armstrong <narmstrong@baylibre.com>
Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>

include/configs/meson64_android.h

@@ -9,6 +9,10 @@
 #ifndef __MESON64_ANDROID_CONFIG_H
 #define __MESON64_ANDROID_CONFIG_H
 
+#include <linux/sizes.h>
+
+#define CONFIG_SYS_MALLOC_LEN	       SZ_128M
+
 #ifndef BOOT_PARTITION
 #define BOOT_PARTITION "boot"
 #endif