qcacld-3.0: Increase the scan database size to 500 from 300

In very noisy environment and with 6 GHz co-located AP, scan
database size of 300 might not be enough.

So increase the size to 500.

Change-Id: I26077b2ab0d24f73a7c8e29990504d5b284eccf4
CRs-Fixed: 3395834

Kbuild

@@ -4479,7 +4479,7 @@ ccflags-y += -DWLAN_PDEV_MAX_VDEVS=$(CONFIG_WLAN_PDEV_MAX_VDEVS)
 CONFIG_WLAN_PSOC_MAX_VDEVS ?= $(CONFIG_WLAN_MAX_VDEVS)
 ccflags-y += -DWLAN_PSOC_MAX_VDEVS=$(CONFIG_WLAN_PSOC_MAX_VDEVS)
 
-CONFIG_MAX_SCAN_CACHE_SIZE ?= 300
+CONFIG_MAX_SCAN_CACHE_SIZE ?= 500
 ccflags-y += -DMAX_SCAN_CACHE_SIZE=$(CONFIG_MAX_SCAN_CACHE_SIZE)
 CONFIG_SCAN_MAX_REST_TIME ?= 0
 ccflags-y += -DSCAN_MAX_REST_TIME=$(CONFIG_SCAN_MAX_REST_TIME)