qcacld-3.0: Add compile time flag for FISA feature

Add compilation flag for FISA and enable it for QCA6490 chip

Change-Id: I7e0e00a764881c44bcb56ca3916e8b2fbee33921
CRs-Fixed: 2600268
diff --git a/configs/default_defconfig b/configs/default_defconfig
index 026158d..ed96444 100644
--- a/configs/default_defconfig
+++ b/configs/default_defconfig
@@ -1046,6 +1046,7 @@
 
 #Enable 6 GHz Band
 CONFIG_BAND_6GHZ := y
+CONFIG_RX_FISA := y
 
 endif