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You can’t. The wifi analyzer app checks the MAC address of the AP, and looks up the vendor.
The same can be done with other online tools, e.g. https://www.wireshark.org/tools/oui-lookup.html
That app is using the MAC address of the AP to determine who the manufacturer is.
You could change the MAC address of the wireless interface to make it look like something else, but there isn’t a way to fool the app into saying anything different. The AP isn’t broadcasting that information, the app is using a lookup in a database of registered MAC addresses.
bkuhn is correct. The app is giving you the manufacture, based on a lookup of the MAC address.
http://www.macvendorlookup.com/search/e48d8c
You can change the MAC address of the interface to spoof a different manufacture, or generate a random unassigned MAC to turn “ROUTERBOARD.COM” into “Unknown”. But unless you have a specific security reason to change the MAC address, it’s best to least it as is.