Update and rename android_args.gn to android_ARM64_args.gn

arm/android_ARM64_args.gn

@@ -3,6 +3,14 @@ google_default_client_id = ""
 google_default_client_secret = ""
 target_os = "android"
 target_cpu = "arm64"
+arm_version = 8
+arm_arch = "armv8-a"
+arm_tune = "generic-armv8-a"
+arm_float_abi = "hard"
+arm_use_thumb = true
+arm_use_neon = true
+arm_optionally_use_neon = false
+arm_fpu = "neon"
 is_official_build = true
 is_debug = false
 debuggable_apks = false