[magma] Add support for import and query

This change adds basic support for importing a DRM device as a magma
device and performing non-buffer queries on it.

This change also updates some identifier names to match AOSP style.

Bug: b/272307395
Test: m libgfxstream_backend
      Ran gfxstream_magma_tests
Change-Id: Iafa5bc49b6730c6e6e8d0fcef9bc02bd9cb79aba
diff --git a/stream-servers/Android.bp b/stream-servers/Android.bp
index 044653d..1f13295 100644
--- a/stream-servers/Android.bp
+++ b/stream-servers/Android.bp
@@ -228,3 +228,18 @@
         "general-tests",
     ],
 }
+
+cc_test_host {
+    name: "gfxstream_magma_tests",
+    defaults: [ "gfxstream_defaults" ],
+    srcs: [
+        "tests/Magma_unittest.cpp",
+    ],
+    shared_libs: [
+        "libbase",
+        "libgfxstream_backend",
+    ],
+    test_suites: [
+        "general-tests",
+    ],
+}