rename symbol: CONFIG_TEGRA -> CONFIG_ARCH_TEGRA

Have this symbol follow the pattern of all other such symbols.

Signed-off-by: Trevor Woerner <twoerner@gmail.com>
diff --git a/drivers/video/Kconfig b/drivers/video/Kconfig
index 7c5012a6..3812354 100644
--- a/drivers/video/Kconfig
+++ b/drivers/video/Kconfig
@@ -128,7 +128,7 @@
 
 config SYS_WHITE_ON_BLACK
 	bool "Display console as white on a black background"
-	default y if ARCH_AT91 || ARCH_EXYNOS || ARCH_ROCKCHIP || TEGRA || X86 || ARCH_SUNXI
+	default y if ARCH_AT91 || ARCH_EXYNOS || ARCH_ROCKCHIP || ARCH_TEGRA || X86 || ARCH_SUNXI
 	help
 	 Normally the display is black on a white background, Enable this
 	 option to invert this, i.e. white on a black background. This can be