Refactor sanitized library on-disk layout - Soong.

This CL moves the location of ASAN-ified libraries on disk in the
following manner:
/data/lib* --> /data/asan/system/lib*
/data/vendor/* --> /data/asan/vendor/*

There are a couple of advantages to this, including better isolation
from other components, and more transparent linker renaming and
SELinux policies.

Bug: 36574794
Bug: 36674745
Test: m -j40 && SANITIZE_TARGET="address" m -j40 and the device
boots. All sanitized libraries are correctly located in /data/asan/*.

Change-Id: I06bf459260ec451d4495a02562f640ad622f34c2

android/module.go

@@ -89,6 +89,7 @@ type ModuleContext interface {
 	AddMissingDependencies(deps []string)
 
 	InstallInData() bool
+	InstallInSanitizerDir() bool
 
 	RequiredModuleNames() []string
 }
@@ -103,6 +104,7 @@ type Module interface {
 	Enabled() bool
 	Target() Target
 	InstallInData() bool
+	InstallInSanitizerDir() bool
 	SkipInstall()
 }
 
@@ -399,6 +401,10 @@ func (p *ModuleBase) InstallInData() bool {
 	return false
 }
 
+func (p *ModuleBase) InstallInSanitizerDir() bool {
+	return false
+}
+
 func (a *ModuleBase) generateModuleTarget(ctx blueprint.ModuleContext) {
 	allInstalledFiles := Paths{}
 	allCheckbuildFiles := Paths{}
@@ -629,6 +635,10 @@ func (a *androidModuleContext) InstallInData() bool {
 	return a.module.InstallInData()
 }
 
+func (a *androidModuleContext) InstallInSanitizerDir() bool {
+	return a.module.InstallInSanitizerDir()
+}
+
 func (a *androidModuleContext) InstallFileName(installPath OutputPath, name string, srcPath Path,
 	deps ...Path) OutputPath {