[PM] Compile libs for both archs

Test: atest PackageManagerServiceHostTests
Test: extract the PackageManagerServiceServerTests.apk, check libs
Bug: 328033038
(cherry picked from https://googleplex-android-review.googlesource.com/q/commit:590c3cf45dc326a78ec0efe5b4285f949bf978ed)
Merged-In: I2b7582b30102c03de8173a17ca5b0851c4fb73c5
Change-Id: I2b7582b30102c03de8173a17ca5b0851c4fb73c5

services/tests/PackageManagerServiceTests/server/Android.bp

@@ -94,7 +94,7 @@ android_test {
         "libutils",
         "netd_aidl_interface-V5-cpp",
     ],
-
+    compile_multilib: "both",
     dxflags: ["--multi-dex"],
 
     java_resources: [