gemini: Drop switch kmod and swconfig

The DIR-685 needs this module compiled in for safety
(it is facing the LAN ports) and it is now (as of
kernel v4.19) using the DSA switch architecture so
swconfig is not needed.

Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

target/linux/gemini/image/Makefile

@@ -142,7 +142,6 @@ define Device/dlink_dir-685
 	DEVICE_TITLE := D-Link DIR-685 Xtreme N Storage Router
 	DEVICE_DTS := gemini-dlink-dir-685
 	DEVICE_PACKAGES := $(GEMINI_NAS_PACKAGES) \
-			kmod-switch-rtl8366rb swconfig \
 			kmod-rt2800-pci
 	IMAGES := factory.bin sysupgrade.bin
 	# Pad to 128k erase blocks with 160 bytes WRGG header