ath79-generic: switch Wave2 firmware to -ct

This partially reverts commit 22c47df2.

Devices in ath79-generic like the TP-Link EAP225-Outdoor v1 are really
unstable with the non -ct Wave2 firmware and regulary crash with 100% memory
consumption when only a handful devices are connected via 5 GHz.

closes freifunk-gluon/gluon#2827

(cherry picked from commit 4badb270)

targets/ath79-generic

@@ -14,13 +14,7 @@ local ATH10K_PACKAGES_QCA9887 = {
 	'-ath10k-firmware-qca9887-ct',
 }
 
-local ATH10K_PACKAGES_QCA9888 = {
-	'kmod-ath10k',
-	'-kmod-ath10k-ct',
-	'-kmod-ath10k-ct-smallbuffers',
-	'ath10k-firmware-qca9888',
-	'-ath10k-firmware-qca9888-ct',
-}
+local ATH10K_PACKAGES_QCA9888 = {}
 
 -- ALFA NETWORK