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/mailbox/Kconfig b/drivers/mailbox/Kconfig
index 85c2a82..dd4b0ac 100644
--- a/drivers/mailbox/Kconfig
+++ b/drivers/mailbox/Kconfig
@@ -19,7 +19,7 @@
 
 config TEGRA_HSP
 	bool "Enable Tegra HSP controller support"
-	depends on DM_MAILBOX && TEGRA
+	depends on DM_MAILBOX && ARCH_TEGRA
 	help
 	  This enables support for the NVIDIA Tegra HSP Hw module, which
 	  implements doorbells, mailboxes, semaphores, and shared interrupts.