fix: romfs中挂载地址支持romfs_bind入参配置方式。

当前romfs中的挂载地址在romfs_hwconfigure中宏配置解决，不够灵活。
解决方法：通过romfs_bind中data入参传递给rm->rm_buffer，而romfs_bind在
调用mount的时候会被关联上，故挂载romfs的时候需要传入mount的地址数据，
例如：mount("romfs", "/", "romfs", 0, 0x41234000); //0x41234000 仅作为例子，可以是变量等

Close #I414RP

Change-Id: I7536ae6680f3e97a945512e88f0d68174a2f3026
Signed-off-by: Nboxi <lewis.liulei@huawei.com>

fs/romfs/fs_romfs.c

@@ -615,6 +615,7 @@ int romfs_bind(struct Mount *mnt, struct Vnode *blkDriver, const void *data)
 
   /* Get the hardware configuration and setup buffering appropriately */
 
+  rm->rm_buffer = (uint8_t *)data;
   ret = romfs_hwconfigure(rm);
   if (ret)
     {

fs/romfs/fs_romfsutil.c

@@ -345,7 +345,12 @@ int romfs_hwconfigure(struct romfs_mountpt_s *rm)
 {
   uint32_t total_size;
 
-  rm->rm_buffer = (uint8_t *)DMA_TO_VMM_ADDR(RAMDISK_ADDR);
+  if (!rm->rm_buffer)
+    {
+      return -ENOMEM;
+    }
+
+
   total_size = romfs_devread32(rm, ROMFS_VHDR_SIZE);
 
   rm->rm_hwnsectors = total_size;
@@ -353,14 +358,6 @@ int romfs_hwconfigure(struct romfs_mountpt_s *rm)
   rm->rm_cachesector = (uint32_t)-1;
   rm->rm_volsize = total_size;
 
-  rm->rm_buffer = (uint8_t *)malloc(total_size);
-  if (!rm->rm_buffer)
-    {
-      return -ENOMEM;
-    }
-
-  memcpy(rm->rm_buffer, (void *)DMA_TO_VMM_ADDR(RAMDISK_ADDR), total_size);
-
   return OK;
 }