U-Boot banner is printed in makefile of u-boot. If you edit following lines, and execute updated u-boot , you can see desired banner.
$(VERSION_FILE):
printf ' #define U_BOOT_VERSION "YOUR STRING" ' \
"$(U_BOOT_VERSION)"
Also, you can edit version, patch level, sublevel and extraversion field of u-boot which are defined at the top of makefile.
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