Use nativePostForkSystemServer for system server profiling

Need to use nativePostForkSystemServer instead of nativePostForkChild
since nativePostForkChild is called after the class loader is created.

Bug: 139883463
Bug: 144383344
Test: showmap `pid system_server` and verify
Test: atest BootImageProfileTest

Change-Id: I7c4f61b08d286ef6056931231f6b835749092720
2 files changed