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/pinephone_defconfig b/configs/pinephone_defconfig
index ae60943..d882c0c 100644
--- a/configs/pinephone_defconfig
+++ b/configs/pinephone_defconfig
@@ -10,6 +10,7 @@
CONFIG_MMC_SUNXI_SLOT_EXTRA=2
CONFIG_PINEPHONE_DT_SELECTION=y
# CONFIG_SYS_MALLOC_CLEAR_ON_INIT is not set
+CONFIG_SPL_STACK=0x54000
CONFIG_SYS_PBSIZE=1024
CONFIG_OF_LIST="sun50i-a64-pinephone-1.1 sun50i-a64-pinephone-1.2"
CONFIG_LED_STATUS=y