Drop IncludeTags

This was previously used in conjunction with blueprint_package_includes
to prune Android.bp files from soong analysis.

Test: m nothing
Bug: 308188212
Change-Id: Ie82e20eec63bd0be70e1cf0290c70f62d5621c76

android/config.go

@@ -1329,10 +1329,6 @@ func (c *config) SourceRootDirs() []string {
 	return c.productVariables.SourceRootDirs
 }
 
-func (c *config) IncludeTags() []string {
-	return c.productVariables.IncludeTags
-}
-
 func (c *config) HostStaticBinaries() bool {
 	return Bool(c.productVariables.HostStaticBinaries)
 }