staging: r8188eu: remove dead led blink functions

LedStrategy is SW_LED_MODE1 in this driver. Remove led blink
functions that are not used for SW_LED_MODE1.
Signed-off-by: Michael Straube <straube.linux@gmail.com>
Link: https://lore.kernel.org/r/20210924204917.6313-2-straube.linux@gmail.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>