Use BaseApexName to generate permission file for sdk library

Permissions of apex variants of shared java sdk libraries should use the
base apex name (com.android.foo) and not the override apex name
(com.mycompany.android.foo). The override apex name started being used
when separate variants were created for override apex transitive deps
(https://r.android.com/3083813)

Bug: 346486531
Test: m com.google.android.ipsec
Test: verified that
out/target/product/<product>/apex/com.google.android.ipsec/etc/permissions/android.net.ipsec.ike.xml
contains /apex/com.androiqd.ipsec/javalib/android.net.ipsec.ike.jar #
previously it contained com.google.android.ipsec

Test: https://android-build.corp.google.com/builds/abtd/run/L59900030004679761
Change-Id: I863170d78efa017bef5e4ece3b1471f74ba84b0c

android/apex.go

@@ -84,6 +84,9 @@ type ApexInfo struct {
 
 	// Returns the name of the test apexes that this module is included in.
 	TestApexes []string
+
+	// Returns the name of the overridden apex (com.android.foo)
+	BaseApexName string
 }
 
 // AllApexInfo holds the ApexInfo of all apexes that include this module.

apex/apex.go

@@ -1040,6 +1040,7 @@ func (a *apexBundle) ApexInfoMutator(mctx android.TopDownMutatorContext) {
 		InApexModules:     []string{a.Name()}, // could be com.mycompany.android.foo
 		ApexContents:      []*android.ApexContents{apexContents},
 		TestApexes:        testApexes,
+		BaseApexName:      mctx.ModuleName(),
 	}
 	mctx.WalkDeps(func(child, parent android.Module) bool {
 		if !continueApexDepsWalk(child, parent) {

java/sdk_library.go

@@ -3279,7 +3279,7 @@ func (module *sdkLibraryXml) implPath(ctx android.ModuleContext) string {
 		// TODO(b/146468504): ApexVariationName() is only a soong module name, not apex name.
 		// In most cases, this works fine. But when apex_name is set or override_apex is used
 		// this can be wrong.
-		return fmt.Sprintf("/apex/%s/javalib/%s.jar", apexInfo.ApexVariationName, implName)
+		return fmt.Sprintf("/apex/%s/javalib/%s.jar", apexInfo.BaseApexName, implName)
 	}
 	partition := "system"
 	if module.SocSpecific() {