gemini: Activate Realtek and vitesse DSA driver again

This activates the wrongly removed DSA drivers again.

Fixes 9ab4d74b5f86 ("kernel: Move some DSA config options to generic config")
Signed-off-by: Hauke Mehrtens <[email protected]>
Reported-by: Linus Walleij <[email protected]>

target/linux/gemini/config-4.19

@@ -335,6 +335,8 @@ CONFIG_NEED_DMA_MAP_STATE=y
 CONFIG_NEED_KUSER_HELPERS=y
 CONFIG_NEED_PER_CPU_KM=y
 CONFIG_NET_DSA=y
+CONFIG_NET_DSA_REALTEK_SMI=y
+CONFIG_NET_DSA_VITESSE_VSC73XX=y
 CONFIG_NET_NS=y
 CONFIG_NET_SWITCHDEV=y
 CONFIG_NLS=y