Remove apex.multi_install_skip_symbol_files

This has been a workaround to avoid duplicate build rules for
multi-install apexes. The reason for duplicate errors was that apex_name
was used to install symbol files.

We don't need to rely on apex_name for symbol files, hence no need for
the workaround.

Note that symbol files for apexes are still available via the paths
based on "soong module name".

Bug: 267581665
Test: cuttlefish (which uses multi-apex) build & run
Change-Id: Icaca667e139ef2aca32339a75b54b12a00449c2d
diff --git a/apex/androidmk.go b/apex/androidmk.go
index b830dcf..f66ae16 100644
--- a/apex/androidmk.go
+++ b/apex/androidmk.go
@@ -95,11 +95,6 @@
 		return moduleNames
 	}
 
-	// Avoid creating duplicate build rules for multi-installed APEXes.
-	if proptools.BoolDefault(a.properties.Multi_install_skip_symbol_files, false) {
-		return moduleNames
-	}
-
 	seenDataOutPaths := make(map[string]bool)
 
 	for _, fi := range a.filesInfo {
diff --git a/apex/apex.go b/apex/apex.go
index a9c8afc..3cdcd79 100644
--- a/apex/apex.go
+++ b/apex/apex.go
@@ -149,16 +149,6 @@
 	// Should be only used in non-system apexes (e.g. vendor: true). Default is false.
 	Use_vndk_as_stable *bool
 
-	// Whether this is multi-installed APEX should skip installing symbol files.
-	// Multi-installed APEXes share the same apex_name and are installed at the same time.
-	// Default is false.
-	//
-	// Should be set to true for all multi-installed APEXes except the singular
-	// default version within the multi-installed group.
-	// Only the default version can install symbol files in $(PRODUCT_OUT}/apex,
-	// or else conflicting build rules may be created.
-	Multi_install_skip_symbol_files *bool
-
 	// The type of APEX to build. Controls what the APEX payload is. Either 'image', 'zip' or
 	// 'both'. When set to image, contents are stored in a filesystem image inside a zip
 	// container. When set to zip, contents are stored in a zip container directly. This type is
diff --git a/apex/builder.go b/apex/builder.go
index 06f1dd0..49223a0 100644
--- a/apex/builder.go
+++ b/apex/builder.go
@@ -455,11 +455,6 @@
 
 	installSymbolFiles := (!ctx.Config().KatiEnabled() || a.ExportedToMake()) && a.installable()
 
-	// Avoid creating duplicate build rules for multi-installed APEXes.
-	if proptools.BoolDefault(a.properties.Multi_install_skip_symbol_files, false) {
-		installSymbolFiles = false
-
-	}
 	// set of dependency module:location mappings
 	installMapSet := make(map[string]bool)