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>
diff --git a/common/spl/Kconfig b/common/spl/Kconfig
index 6fc97f4..3fd113d 100644
--- a/common/spl/Kconfig
+++ b/common/spl/Kconfig
@@ -78,6 +78,7 @@
 	hex "Maximum size of the SPL image, excluding BSS"
 	default 0x30000 if ARCH_MX6 && MX6_OCRAM_256KB
 	default 0x1b000 if AM33XX && !TI_SECURE_DEVICE
+	default 0xec00 if OMAP34XX
 	default 0x10000 if ARCH_MX6 && !MX6_OCRAM_256KB
 	default 0x7fa0 if SUNXI_SRAM_ADDRESS = 0x10000
 	default 0x7fa0 if SUNXI_SRAM_ADDRESS = 0x20000 && !MACH_SUN50I_H616