Revert "Use hashed subdir for soong_config modules"

This reverts commit 81b00a8db7.

Reason for revert:
* select() will supersede Soong config modules.
* A tiny change can make hundreds of gigabytes rebuilt.
* Hashed out/ directories are not cleaned.
* Even without this trace, AB build time is fast enough, thanks to
  product-specific ninja files and so on.

Bug: 348548855
Test: m --no-skip-soong-tests
Change-Id: If9a97df1e161a9ef0fb1b801f9e129b71b11d1ac

android/module_context.go

@@ -188,7 +188,6 @@ type ModuleContext interface {
 	TargetRequiredModuleNames() []string
 
 	ModuleSubDir() string
-	SoongConfigTraceHash() string
 
 	Variable(pctx PackageContext, name, value string)
 	Rule(pctx PackageContext, name string, params blueprint.RuleParams, argNames ...string) blueprint.Rule
@@ -377,10 +376,6 @@ func (m *moduleContext) ModuleSubDir() string {
 	return m.bp.ModuleSubDir()
 }
 
-func (m *moduleContext) SoongConfigTraceHash() string {
-	return m.module.base().commonProperties.SoongConfigTraceHash
-}
-
 func (m *moduleContext) InstallInData() bool {
 	return m.module.InstallInData()
 }