Add missing cortex-a76 arm configuration

Change-Id: I55620e602b9e97fe7a6d36fa142ddfde77b6025b
diff --git a/cc/config/arm_device.go b/cc/config/arm_device.go
index cd7c410..d37e486 100644
--- a/cc/config/arm_device.go
+++ b/cc/config/arm_device.go
@@ -236,6 +236,7 @@
 		"cortex-a72":     "${config.ArmClangCortexA53Cflags}",
 		"cortex-a73":     "${config.ArmClangCortexA53Cflags}",
 		"cortex-a75":     "${config.ArmClangCortexA55Cflags}",
+		"cortex-a76":     "${config.ArmClangCortexA55Cflags}",
 		"krait":          "${config.ArmClangKraitCflags}",
 		"kryo":           "${config.ArmClangKryoCflags}",
 		"kryo385":        "${config.ArmClangCortexA53Cflags}",