spl: Set SPL_MAX_SIZE default for AST2600

The AST2600 bootrom has a max size of 64KB. This can be overridden if the
system is running the SPL from SPI NOR and not using secure boot.

Signed-off-by: Joel Stanley <joel@jms.id.au>
diff --git a/common/spl/Kconfig b/common/spl/Kconfig
index 3fd5644..4851834 100644
--- a/common/spl/Kconfig
+++ b/common/spl/Kconfig
@@ -82,6 +82,7 @@
 	default 0x7fa0 if SUNXI_SRAM_ADDRESS = 0x20000 && !MACH_SUN50I_H616
 	default 0x7000 if RCAR_GEN3
 	default 0x5fa0 if SUNXI_SRAM_ADDRESS = 0x0
+	default 0x10000 if ASPEED_AST2600
 	default 0x0
 	help
 	  Maximum size of the SPL image (text, data, rodata, and linker lists