omap3: Define maximum SPL size in Kconfig instead of defconfigs

The maximum SPL 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>
10 files changed