staging: r8188eu: remove unused defines for dynamic functions

Remove a couple of DYNAMIC_BB_... defines which are not used
by this driver.

Signed-off-by: Martin Kaiser <martin@kaiser.cx>
Link: https://lore.kernel.org/r/20220321203031.143486-3-martin@kaiser.cx


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