Set relative path to ART tests back to `art/$ISA` instead of `test/$ISA`.

This is to address run-test failures. Some of the test logic still
relies on finding test libraries under `/data/nativetest{,64}/art/$ISA`.

This change is a partial revert of 61f071630083775fe64d177455a056daa7071eca.

Test: Run ART run-tests on device
Test: art/build/apex/runtests.sh
Bug: 129534335
Change-Id: I1ce241ff994bfbd789affdcccf360d6f8c62ce61
diff --git a/test/Android.bp b/test/Android.bp
index 81c0bc1..2254477 100644
--- a/test/Android.bp
+++ b/test/Android.bp
@@ -19,22 +19,22 @@
     host_supported: true,
     target: {
         android_arm: {
-            relative_install_path: "test/arm",
+            relative_install_path: "art/arm",
         },
         android_arm64: {
-            relative_install_path: "test/arm64",
+            relative_install_path: "art/arm64",
         },
         android_mips: {
-            relative_install_path: "test/mips",
+            relative_install_path: "art/mips",
         },
         android_mips64: {
-            relative_install_path: "test/mips64",
+            relative_install_path: "art/mips64",
         },
         android_x86: {
-            relative_install_path: "test/x86",
+            relative_install_path: "art/x86",
         },
         android_x86_64: {
-            relative_install_path: "test/x86_64",
+            relative_install_path: "art/x86_64",
         },
         darwin: {
             enabled: false,