global: Migrate CONFIG_TEGRA_BOARD_STRING to CFG

Perform a simple rename of CONFIG_TEGRA_BOARD_STRING to CFG_TEGRA_BOARD_STRING

Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/include/configs/p2571.h b/include/configs/p2571.h
index 8a1e7d9..5155aa7 100644
--- a/include/configs/p2571.h
+++ b/include/configs/p2571.h
@@ -12,7 +12,7 @@
 #include "tegra210-common.h"
 
 /* High-level configuration options */
-#define CONFIG_TEGRA_BOARD_STRING	"NVIDIA P2571"
+#define CFG_TEGRA_BOARD_STRING	"NVIDIA P2571"
 
 /* Board-specific serial config */