Revert "Sandbox soong_build by changing to root directory"

This reverts commit 05c25ccb4a.

Reason for revert: broke absolute OUT_DIR
Bug: 146437378

Change-Id: I523ed79d40e1c1ef040212ba794a7a084abea75d

android/module.go

@@ -16,13 +16,13 @@ package android
 
 import (
 	"fmt"
-	"os"
 	"path"
 	"path/filepath"
 	"strings"
 	"text/scanner"
 
 	"github.com/google/blueprint"
+	"github.com/google/blueprint/pathtools"
 	"github.com/google/blueprint/proptools"
 )
 
@@ -91,8 +91,7 @@ type EarlyModuleContext interface {
 
 	Glob(globPattern string, excludes []string) Paths
 	GlobFiles(globPattern string, excludes []string) Paths
-	IsSymlink(path Path) bool
-	Readlink(path Path) string
+	Fs() pathtools.FileSystem
 }
 
 // BaseModuleContext is the same as blueprint.BaseModuleContext except that Config() returns
@@ -1173,22 +1172,6 @@ func (e *earlyModuleContext) GlobFiles(globPattern string, excludes []string) Pa
 	return pathsForModuleSrcFromFullPath(e, ret, false)
 }
 
-func (b *earlyModuleContext) IsSymlink(path Path) bool {
-	fileInfo, err := b.config.fs.Lstat(path.String())
-	if err != nil {
-		b.ModuleErrorf("os.Lstat(%q) failed: %s", path.String(), err)
-	}
-	return fileInfo.Mode()&os.ModeSymlink == os.ModeSymlink
-}
-
-func (b *earlyModuleContext) Readlink(path Path) string {
-	dest, err := b.config.fs.Readlink(path.String())
-	if err != nil {
-		b.ModuleErrorf("os.Readlink(%q) failed: %s", path.String(), err)
-	}
-	return dest
-}
-
 func (e *earlyModuleContext) Module() Module {
 	module, _ := e.EarlyModuleContext.Module().(Module)
 	return module