ath79-generic: add missing ath10k packages

The devolo WiFi pro 1200i lost it's ath10k package definitions while
rebasing, thus selecting the wrong package set.

Fix it by adding the correct firmware and driver.

targets/ath79-generic

+local ATH10K_PACKAGES_QCA9880 = {
+	'kmod-ath10k',
+	'-kmod-ath10k-ct',
+	'ath10k-firmware-qca988x',
+	'-ath10k-firmware-qca988x-ct',
+}
+
 local ATH10K_PACKAGES_QCA9888 = {
 	'kmod-ath10k',
 	'-kmod-ath10k-ct',
@@ -8,6 +15,7 @@ local ATH10K_PACKAGES_QCA9888 = {
 -- devolo
 
 device('devolo-wifi-pro-1200i', 'devolo_dvl1200i', {
+	packages = ATH10K_PACKAGES_QCA9880,
 	factory = false,
 })