staging: r8188eu: merge DeInitLed871x and rtl8188eu_DeInitSwLeds

Merge DeInitLed871x and rtl8188eu_DeInitSwLeds, both of which are
small and simple.

Signed-off-by: Martin Kaiser <martin@kaiser.cx>
Link: https://lore.kernel.org/r/20211226195556.159471-6-martin@kaiser.cx


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>