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/db-88f6820-gp_defconfig b/configs/db-88f6820-gp_defconfig
index 8243a49..04a07e0 100644
--- a/configs/db-88f6820-gp_defconfig
+++ b/configs/db-88f6820-gp_defconfig
@@ -28,6 +28,8 @@
CONFIG_SPL_MAX_SIZE=0x22fd0
CONFIG_SPL_BSS_MAX_SIZE=0x4000
CONFIG_SPL_SYS_MALLOC_SIMPLE=y
+# CONFIG_SPL_SHARES_INIT_SP_ADDR is not set
+CONFIG_SPL_STACK=0x4002c000
CONFIG_SPL_I2C=y
CONFIG_SYS_MAXARGS=32
CONFIG_CMD_I2C=y