staging: rtl8188eu: remove more unused defines

Remove some defines for register addresses and bits which obviously
refer to chipsets other than rtl8188eu.

Signed-off-by: Martin Kaiser <martin@kaiser.cx>
Link: https://lore.kernel.org/r/20210620175301.14988-13-martin@kaiser.cx


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