kernel: rtl8367(b): fix build error

Fix build on targets not using CONFIG_MODULE_STRIPPED.

Neither RTL8367_DRIVER_DESC nor RTL8367B_DRIVER_DESC are defined
anywhere. It worked for targets using CONFIG_MODULE_STRIPPED since our
module stripper no-ops the various module info macros.

Signed-off-by: Mathias Kresin <dev@kresin.me>