SF: Remove composer sequence IDs

Multiple HWC instances are no longer supported since VR was nixed.

Also, rename HAL callbacks so their origin is clear.

Bug: 182939859
Test: Build
Change-Id: Ia09b120dce1a4659a3cbb8927d44da8fba266c54
diff --git a/services/surfaceflinger/tests/unittests/Android.bp b/services/surfaceflinger/tests/unittests/Android.bp
index 88fb811..de511f3 100644
--- a/services/surfaceflinger/tests/unittests/Android.bp
+++ b/services/surfaceflinger/tests/unittests/Android.bp
@@ -68,7 +68,7 @@
         "SurfaceFlinger_GetDisplayNativePrimariesTest.cpp",
         "SurfaceFlinger_HandleTransactionLockedTest.cpp",
         "SurfaceFlinger_NotifyPowerBoostTest.cpp",
-        "SurfaceFlinger_OnHotplugReceivedTest.cpp",
+        "SurfaceFlinger_HotplugTest.cpp",
         "SurfaceFlinger_OnInitializeDisplaysTest.cpp",
         "SurfaceFlinger_SetDisplayStateTest.cpp",
         "SurfaceFlinger_SetPowerModeInternalTest.cpp",