Remove apex10000_private variants

When a library is included in two APEXes whose platform_apis settings
are different, two apex variants of the library is created: apex1000 and
apex1000_private.

This change was introduced with ag/15061306, especially by the commit
[1].

However, that part should be reverted because it actually creates
unnecessary variants. It's unnecessary because the two variants of the
library are compiled (excluding the linking) exactly the same. If a
private symbol of its dependency was actually used when compiling the
apex1000_private variant, then the other apex1000 variant wouldn't have
been built because that private symbol must have caused a linkage error.

[1] https://googleplex-android-review.git.corp.google.com/c/platform/build/soong/+/15061306/2..4/android/apex.go#b527).

Bug: 228785792
Test: m
Change-Id: Id58d3e98a51de5e628ca72ef86e9cd11b0ee8971
diff --git a/apex/apex_test.go b/apex/apex_test.go
index 5021f27..9c44093 100644
--- a/apex/apex_test.go
+++ b/apex/apex_test.go
@@ -1038,10 +1038,10 @@
 
 	// Ensure that we are using non-stub variants of mylib2 and libfoo.shared_from_rust (because
 	// of the platform_apis: true)
-	mylibLdFlags := ctx.ModuleForTests("mylib", "android_arm64_armv8-a_shared_apex10000_private").Rule("ld").Args["libFlags"]
+	mylibLdFlags := ctx.ModuleForTests("mylib", "android_arm64_armv8-a_shared_apex10000").Rule("ld").Args["libFlags"]
 	ensureNotContains(t, mylibLdFlags, "mylib2/android_arm64_armv8-a_shared_current/mylib2.so")
 	ensureContains(t, mylibLdFlags, "mylib2/android_arm64_armv8-a_shared/mylib2.so")
-	rustDeps := ctx.ModuleForTests("foo.rust", "android_arm64_armv8-a_apex10000_private").Rule("rustc").Args["linkFlags"]
+	rustDeps := ctx.ModuleForTests("foo.rust", "android_arm64_armv8-a_apex10000").Rule("rustc").Args["linkFlags"]
 	ensureNotContains(t, rustDeps, "libfoo.shared_from_rust/android_arm64_armv8-a_shared_current/libfoo.shared_from_rust.so")
 	ensureContains(t, rustDeps, "libfoo.shared_from_rust/android_arm64_armv8-a_shared/libfoo.shared_from_rust.so")
 }