staging: r8188eu: remove the helpers of usb_read_port()

Remove the unnecessary _rtw_read_port() and usb_read_port() and embed their
code into the caller (i.e., rtw_read_port()).

_rtw_read_port() is a mere redefinition of rtw_read_port() and it is
unneeded. usb_read_port() was the only functions assigned to the
(*_usb_read_port) pointer, so we can simply remove it and make a direct
call.

This patch is in preparation for the _io_ops structure removal.

Reviewed-by: Dan Carpenter <[email protected]>
Co-developed-by: Fabio M. De Francesco <[email protected]>
Signed-off-by: Fabio M. De Francesco <[email protected]>
Signed-off-by: Pavel Skripkin <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Greg Kroah-Hartman <[email protected]>

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