staging: r8188eu: merge two led structs

The led layer uses struct led_priv and struct LED_871x to store state
info. Merge the two structs. Move LED_871x's components into led_priv.

Tested-by: Philipp Hortmann <philipp.g.hortmann@gmail.com> # Edimax N150
Signed-off-by: Martin Kaiser <martin@kaiser.cx>
Link: https://lore.kernel.org/r/20220626181000.287225-1-martin@kaiser.cx


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