staging: r8188eu: clean up blinking macros

Clean up the macros that check the blinking mode of a LED.

The macro IS_LED_BLINKING is not used and can be removed.

The IS_LED_WPS_BLINKING macro is used only by rtw_led.c. Move the macro
into this file. The macro parameter is always a struct LED_871x *,
there's no need for a cast. Rename the parameter to l and put it in
parentheses, which is good practice for macro parameters.

Signed-off-by: Martin Kaiser <martin@kaiser.cx>
Link: https://lore.kernel.org/r/20211226195556.159471-9-martin@kaiser.cx


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