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/pci/Kconfig b/drivers/pci/Kconfig
index 437cd9a..6fc2688 100644
--- a/drivers/pci/Kconfig
+++ b/drivers/pci/Kconfig
@@ -111,7 +111,7 @@
 
 config PCI_TEGRA
 	bool "Tegra PCI support"
-	depends on TEGRA
+	depends on ARCH_TEGRA
 	depends on (TEGRA186 && POWER_DOMAIN) || (!TEGRA186)
 	help
 	  Enable support for the PCIe controller found on some generations of