Add hal_graphics_mapper_service type

This is used for mapper sphal library which is defined in VINTF and
queried via servicemanager.

Bug: 317178925
Test: cuttlefish loads mapper.minigbm
Change-Id: Ibddc0239e52065a89c656f885f34835406665009
diff --git a/tests/sepolicy_tests.py b/tests/sepolicy_tests.py
index 7a341cb..1df8231 100644
--- a/tests/sepolicy_tests.py
+++ b/tests/sepolicy_tests.py
@@ -190,6 +190,7 @@
         "hal_graphics_allocator_hwservice":["hwservice_manager"],
         "hal_graphics_allocator_server":["binder", "service_manager"],
         "hal_graphics_mapper_hwservice":["hwservice_manager"],
+        "hal_graphics_mapper_service":["service_manager"],
         "hal_neuralnetworks": ["binder", "fd"],
         "hal_neuralnetworks_service": ["service_manager"],
         "hal_neuralnetworks_hwservice":["hwservice_manager"],