global: Migrate CONFIG_STACKBASE to CFG

Perform a simple rename of CONFIG_STACKBASE to CFG_STACKBASE

Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/include/configs/tegra20-common.h b/include/configs/tegra20-common.h
index 617bfb2..a313ac2 100644
--- a/include/configs/tegra20-common.h
+++ b/include/configs/tegra20-common.h
@@ -16,7 +16,7 @@
 /*
  * Miscellaneous configurable options
  */
-#define CONFIG_STACKBASE	0x03800000	/* 56MB */
+#define CFG_STACKBASE	0x03800000	/* 56MB */
 
 /*-----------------------------------------------------------------------
  * Physical Memory Map