Convert CONFIG_SPL_STACK to Kconfig
This converts the following to Kconfig:
CONFIG_SPL_STACK
Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/configs/libretech_all_h3_it_h5_defconfig b/configs/libretech_all_h3_it_h5_defconfig
index 5bc923a..1b08333 100644
--- a/configs/libretech_all_h3_it_h5_defconfig
+++ b/configs/libretech_all_h3_it_h5_defconfig
@@ -7,6 +7,7 @@
CONFIG_MMC_SUNXI_SLOT_EXTRA=2
CONFIG_SPL_SPI_SUNXI=y
# CONFIG_SYS_MALLOC_CLEAR_ON_INIT is not set
+CONFIG_SPL_STACK=0x54000
CONFIG_SYS_PBSIZE=1024
CONFIG_SPI_FLASH_XMC=y
CONFIG_SPI=y