sparc: move CONFIG_SYS_TEXT_BASE to Kconfig

Defining CONFIG_SYS_TEXT_BASE in config.mk is very old style.

Create CONFIG_SYS_TEXT_BASE option in Kconfig, but let it
depend on CONFIG_SPARC because we do not want to disturb
the other architectures that still define CONFIG_SYS_TEXT_BASE
in their header files.

Signed-off-by: Masahiro Yamada <yamada.m@jp.panasonic.com>
Cc: Daniel Hellstrom <daniel@gaisler.com>
diff --git a/Kconfig b/Kconfig
index 932fc8b..f34f341 100644
--- a/Kconfig
+++ b/Kconfig
@@ -107,6 +107,12 @@
 	  configuration to Kconfig. Since this option will be removed sometime,
 	  new boards should not use this option.
 
+config SYS_TEXT_BASE
+	depends on SPARC
+	hex "Text Base"
+	help
+	  TODO: Move CONFIG_SYS_TEXT_BASE for all the architecture
+
 endmenu		# Boot images
 
 source "arch/Kconfig"