staging: rtl8188eu: remove a bunch of unused defines

Only RF_CHANGE_BY_PS is used by this driver, the other
RF_CHANGE_BY_... defines can be removed.

Signed-off-by: Martin Kaiser <martin@kaiser.cx>
Link: https://lore.kernel.org/r/20210725155902.32433-7-martin@kaiser.cx


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