staging: rtl8723bs: remove unused code blocks conditioned by never set CONFIG_USB_VENDOR*

remove conditional code blocks checked by unused
CONFIG_USB_VENDOR family defines

cleaning required in TODO file:

find and remove code blocks guarded by never set CONFIG_FOO defines

Signed-off-by: Fabio Aiuto <fabioaiuto83@gmail.com>
Link: https://lore.kernel.org/r/037983b85ccc2747284c9002a51c28a7290321ea.1615907632.git.fabioaiuto83@gmail.com


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