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/orangepi_pc_plus_defconfig b/configs/orangepi_pc_plus_defconfig
index 8457b78..3063867 100644
--- a/configs/orangepi_pc_plus_defconfig
+++ b/configs/orangepi_pc_plus_defconfig
@@ -6,6 +6,7 @@
CONFIG_DRAM_CLK=624
CONFIG_MMC_SUNXI_SLOT_EXTRA=2
# CONFIG_SYS_MALLOC_CLEAR_ON_INIT is not set
+CONFIG_SPL_STACK=0x8000
CONFIG_SPL_I2C=y
CONFIG_SYS_PBSIZE=1024
CONFIG_SPL_SYS_I2C_LEGACY=y