qcacld-3.0: Remove unused SCAN code under NAPIER_SCAN define

Clean up unused legacy scan code under NAPIER_SCAN define.

Change-Id: I7e04b4488b10021d6815e76d0a55e040756b1794
CRs-Fixed: 2253647

configs/genoa.snoc.debug_defconfig

@@ -24,7 +24,6 @@ CONFIG_WIFI_POS_LEGACY := n
 CONFIG_FEATURE_WLAN_WAPI := y
 CONFIG_AGEIE_ON_SCAN_RESULTS := y
 CONFIG_LEGACY_CHAN_ENUM := y
-CONFIG_NAPIER_SCAN := y
 CONFIG_WLAN_PMO_ENABLE := y
 CONFIG_CONVERGED_P2P_ENABLE := y
 CONFIG_WLAN_POLICY_MGR_ENABLE := y