universal7885: Move soong namespace import to root of the tree

Because it was on the same file as power hal, the power hal was not on the target list
Fixes DT2W on settings app, overall deep sleep

universal7885-common/Android.bp

@@ -1,2 +1,6 @@
 soong_namespace {
-}
+    imports: [
+        "hardware/google/pixel",
+        "hardware/google/interfaces",
+    ],
+}

universal7885-common/bin/hardware/samsung/power-libperfmgr/Android.bp

@@ -13,13 +13,6 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-soong_namespace {
-    imports: [
-        "hardware/google/pixel",
-        "hardware/google/interfaces",
-    ],
-}
-
 cc_binary {
     name: "android.hardware.power-service.samsung-libperfmgr",
     relative_install_path: "hw",