Added year of introduction

Author: Tomaz Zaman

config/boards/gateway-dk.conf

@@ -11,6 +11,7 @@ BOOT_FDT_FILE="freescale/mono-gateway-dk.dtb"
 BOOTENV_FILE="gateway-dk.txt"
 # Remove fake-hwclock: we have a real pcf2131 RTC, util-linux-extra handles sync via udev
 PACKAGE_LIST_BOARD_REMOVE="fake-hwclock"
+INTRODUCED="2026"
 
 # U-Boot, ATF, and RCW — Mono forks with custom DDR4 config and SERDES
 declare -g BOOTSOURCE="https://github.com/we-are-mono/u-boot"