board: visionfive2: Fixup memory size passed to kernel

Use fdt_fixup_memory to make the memory size data from dtb match
the actual size.

Signed-off-by: Shengyu Qu <wiagn233@outlook.com>
Tested-by: Milan P. Stanić <mps@arvanta.net>
diff --git a/board/starfive/visionfive2/starfive_visionfive2.c b/board/starfive/visionfive2/starfive_visionfive2.c
index 07dcca2..07e171c 100644
--- a/board/starfive/visionfive2/starfive_visionfive2.c
+++ b/board/starfive/visionfive2/starfive_visionfive2.c
@@ -9,8 +9,10 @@
 #include <asm/sections.h>
 #include <cpu_func.h>
 #include <dm.h>
+#include <fdt_support.h>
 #include <linux/bitops.h>
 
+DECLARE_GLOBAL_DATA_PTR;
 #define JH7110_L2_PREFETCHER_BASE_ADDR		0x2030000
 #define JH7110_L2_PREFETCHER_HART_OFFSET	0x2000
 
@@ -51,3 +53,8 @@
 
 	return (ulong *)&_end;
 }
+
+int ft_board_setup(void *blob, struct bd_info *bd)
+{
+	return fdt_fixup_memory(blob, 0x40000000, gd->ram_size);
+}