ramips: fix for Keenetic KN-1910

Set nand flash for KN-1910

Sysupgrade or any other method i tried (asu, owut) not working without it. Tested with a local build.

Signed-off-by: Esat Yiğithan GÖKTOPRAK <[email protected]>
Link: https://github.com/openwrt/openwrt/pull/22311
Signed-off-by: Hauke Mehrtens <[email protected]>
(cherry picked from commit d97381aff3186fa8b655e1d3eb6584febfd80298)

target/linux/ramips/mt7621/base-files/lib/upgrade/platform.sh

@@ -111,6 +111,7 @@ platform_do_upgrade() {
 	iptime,ax2004m|\
 	iptime,t5004|\
 	jcg,q20|\
+	keenetic,kn-1910|\
 	keenetic,kn-3510|\
 	linksys,e5600|\
 	linksys,e7350|\