Remove ioutil.TempDir from each android/soong/android test

android_test.go already sets up a global buildDir, no need to create
one in each test.

Test: All soong tests
Change-Id: Ib85cbf78c604ad3cef64aa00b6bd812a81496e9e

android/path_properties_test.go

@@ -15,8 +15,6 @@
 package android
 
 import (
-	"io/ioutil"
-	"os"
 	"reflect"
 	"testing"
 )
@@ -85,12 +83,6 @@ func TestPathDepsMutator(t *testing.T) {
 		},
 	}
 
-	buildDir, err := ioutil.TempDir("", "soong_path_properties_test")
-	if err != nil {
-		t.Fatal(err)
-	}
-	defer os.RemoveAll(buildDir)
-
 	for _, test := range tests {
 		t.Run(test.name, func(t *testing.T) {
 			config := TestArchConfig(buildDir, nil)