tegra124: Add stack related config options to the Kconfig.

Otherwise the stack ends up down at 0 and has 0 bytes.

Change-Id: I0e3c80a0c5b0180d95819ab44829c2a0b527a54d
Signed-off-by: Gabe Black <gabeblack@google.com>
Reviewed-on: https://chromium-review.googlesource.com/171015
Reviewed-by: Ronald Minnich <rminnich@chromium.org>
Commit-Queue: Gabe Black <gabeblack@chromium.org>
Tested-by: Gabe Black <gabeblack@chromium.org>
(cherry picked from commit 3e69a477474697bcbc40762ec166e8a515d8b0c2)
Signed-off-by: Isaac Christensen <isaac.christensen@se-eng.com>
Reviewed-on: http://review.coreboot.org/6619
Tested-by: build bot (Jenkins)
Reviewed-by: Ronald G. Minnich <rminnich@gmail.com>

src/soc/nvidia/tegra124/Kconfig

@@ -39,4 +39,16 @@ config BOOTBLOCK_BASE
 	hex
 	default 0x80000000
 
+config STACK_TOP
+	hex
+	default 0x80400000
+
+config STACK_BOTTOM
+	hex
+	default 0x803f8000
+
+config STACK_SIZE
+	hex
+	default 0x800
+
 endif