uboot-envtools: ipq50xx: add support for ELECOM WRC-X3000GS2
Add support for ELECOM WRC-X3000GS2 to update "bootdelay" variable
configured as "0" by default when sysupgrade.
Signed-off-by: INAGAKI Hiroshi <[email protected]>
Link: https://github.com/openwrt/openwrt/pull/18543
Signed-off-by: Robert Marko <[email protected]>