net: Fix Makefile to compile linkdata card driver successfully

[Avenger-285714]

Change 'obj-$(NET_VENDOR_LINKDATA) += linkdata/' to 'obj-$(CONFIG_NET_VENDOR_LINKDATA) += linkdata/'.

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关键摘要:

• 在Makefile中，NET_VENDOR_LINKDATA宏可能已被弃用，需要确认是否仍然需要支持。
• 检查CONFIG_NET_VENDOR_LINKDATA是否已在Kconfig文件中定义，以确保Makefile的更改不会导致编译错误。

合并相似的问题是否建议立即修改:

• 是，需要确保代码库的兼容性和正确性，特别是在配置选项和宏的使用上。