moveconfig: migrate TPL_STACK, TPL_TEXT_BASE and TPL_MAX_SIZE

We can finally drop TPL_STACK, TPL_TEXT_BASE and TPL_MAX_SIZE off the
whitelist (this time it's really happening!) and migrate the setting
(only used on the RK3368-uQ7 so far) into Kconfig.

Signed-off-by: Philipp Tomsich <philipp.tomsich@theobroma-systems.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
diff --git a/common/spl/Kconfig b/common/spl/Kconfig
index 1a90588..192f7f6 100644
--- a/common/spl/Kconfig
+++ b/common/spl/Kconfig
@@ -754,6 +754,7 @@
 
 config TPL_MAX_SIZE
         int "Maximum size (in bytes) for the TPL stage"
+	default 0
 	depends on TPL
 	help
 	  The maximum size (in bytes) of the TPL stage.