Change hwui_unit_tests (and benchmarks) to push to non-root writable dir

...and switch to more appropriate "general-tests" suite type.

This allows the test suite to be run in certain lab/infra scenarios,
like on ABTD.

Docs
device-tests to general-tests:
https://source.android.com/docs/core/tests/development/test-mapping#packaging_build_script_rules

Tests
Without this change:
https://android-build.googleplex.com/builds/abtd/run/L10000000957295240
(tooling fails to push content)
With this change:
https://android-build.googleplex.com/builds/abtd/run/L52900000957292742
(gets past tooling failure, and fails on an actually failing unit test)

Test: compare ABTD runs with and without this CL
Bug: 257123741
Change-Id: I33696a0f1c9279622138e4dc4c49d73c99f359eb
diff --git a/libs/hwui/Android.bp b/libs/hwui/Android.bp
index 29f3773..7b7677f 100644
--- a/libs/hwui/Android.bp
+++ b/libs/hwui/Android.bp
@@ -636,7 +636,7 @@
 cc_defaults {
     name: "hwui_test_defaults",
     defaults: ["hwui_defaults"],
-    test_suites: ["device-tests"],
+    test_suites: ["general-tests"],
     header_libs: ["libandroid_headers_private"],
     target: {
         android: {