Rename Edison brillo config to iot

Change-Id: I6ac14045eb5f309ec7d93ea413537c69b4e6c008
diff --git a/arch/x86/configs/i386_brillo_edison_defconfig b/arch/x86/configs/i386_iot_edison_defconfig
similarity index 100%
rename from arch/x86/configs/i386_brillo_edison_defconfig
rename to arch/x86/configs/i386_iot_edison_defconfig