add u-boot crosstool to fix u-boot can not build by buildroot crosstool 7.0...

guowenxue

2019-08-24 a6177b46d08f140c3287e79d4b99f78621ddfa5e

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config RTL8188EU
    tristate "Realtek 8188E USB WiFi"
    depends on USB
    ---help---
      Help message of RTL8188EU