Rename dynamic_android to dynamic_system

Per API review, dynamic_android should be renamed to dynamic_system.

Bug: 126613281
Test: run DynamicSystemInstallationService via adb
Change-Id: Ia908cdd0c21b3a82f59b30e03a985dc260530230
diff --git a/private/service_contexts b/private/service_contexts
index 2ce4cb1..500445d 100644
--- a/private/service_contexts
+++ b/private/service_contexts
@@ -60,7 +60,7 @@
 drm.drmManager                            u:object_r:drmserver_service:s0
 dropbox                                   u:object_r:dropbox_service:s0
 dumpstate                                 u:object_r:dumpstate_service:s0
-dynamic_android                           u:object_r:dynamic_android_service:s0
+dynamic_system                            u:object_r:dynamic_system_service:s0
 econtroller                               u:object_r:radio_service:s0
 euicc_card_controller                     u:object_r:radio_service:s0
 external_vibrator_service                 u:object_r:external_vibrator_service:s0