Revert "libhwui: avoid creating GPU context in Zygote"

The original CL is not needed as HardwareRenderer.preload is not in Zygote but at app launch time.

Bug: 162242036
Change-Id: I41e46e22cb9730b350feb9f6acb2021264a18a97
Test: atest CtsUiRenderingTestCases all pass on GL backend
Test: atest CtsUiRenderingTestCases no regression on VK backend
1 file changed