Switch drivers for RTL8366S/RB were packaged as modules but not properly
added to device definitions for WZR-HP-G300NH router variants, breaking
network access to both after installation or upgrade.
Assign the correct switch driver package for each router.
Fixes: 6e0f0eae5b ("ath79: use rtl8366s and rtl8366_smi as a module")
Fixes: 575ec7a4b1 ("ath79: use rtl8366rb as a module")
Signed-off-by: Tony Ambardar <itugrok@yahoo.com>