kevin/linux.config: enable ath9k spectral scan and debugfs

src/platform/kevin/linux.config

@@ -2187,8 +2187,8 @@ CONFIG_ATH9K_RFKILL=y
 CONFIG_ATH9K_PCOEM=y
 CONFIG_ATH9K_PCI_NO_EEPROM=m
 CONFIG_ATH9K_HTC=m
-# CONFIG_ATH9K_HTC_DEBUGFS is not set
+CONFIG_ATH9K_HTC_DEBUGFS=y
-# CONFIG_ATH9K_COMMON_SPECTRAL is not set
+CONFIG_ATH9K_COMMON_SPECTRAL=y
 CONFIG_CARL9170=m
 CONFIG_CARL9170_LEDS=y
 # CONFIG_CARL9170_DEBUGFS is not set
@@ -8002,3 +8002,8 @@ CONFIG_MEMTEST=y
 # CONFIG_WARN_MISSING_DOCUMENTS is not set
 # CONFIG_WARN_ABI_ERRORS is not set
 # end of Kernel hacking
+
+
+# https://wireless.wiki.kernel.org/en/users/drivers/ath9k/spectral_scan
+ATH9K_COMMON_SPECTRAL=y
+CONFIG_ATH9K_HTC_DEBUGFS=y