omap3: Define maximum U-Boot size in Kconfig instead of defconfigs

The maximum U-Boot size was defined to the same value in each OMAP3
board defconfig. Move the common definition to the Kconfig option
declaration instead.

Signed-off-by: Paul Kocialkowski <contact@paulk.fr>
Reviewed-by: Tom Rini <trini@konsulko.com>
Tested-by: Derald D. Woods <woods.technical@gmail.com>
9 files changed