[FS#223] Support RTL8188ETV

[LEDE Bugs]

The following task has a new comment added:

FS#223 - Support RTL8188ETV
User who did this - Álvaro Fernández Rojas (Noltari)

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Isn't RTL8188ETV already supported by selecting kmod-rtl8xxxu and rtl8188eu-firmware?
It will only work in STA mode but it should work oob with latest revision.
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More information can be found at the following URL:
https://bugs.lede-project.org/index.php?do=details&task_id=223#comment633