Remove workarounds initializing command buffer EGL

Remove workarounds initializing command buffer EGL

The eglDisplay() of command buffer EGL implementation now does not
allocate a new EGL display per call, rather just returns the global.

The EGL implementation is fixed as part of bug 581634.

Removes eglTerminate call, as it's should not be used in Skia at the
moment. The call will terminate all of EGL, which is not intendend. The
previous usage was only due to incorrect implementation of the API.  Not
added back to anywhere else, leaking EGL globals is as
designed. Discussed in https://chromiumcodereview.appspot.com/1733323002.

BUG=581634, 603223
GOLD_TRYBOT_URL= https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&issue=1978733003

Review-Url: https://codereview.chromium.org/1978733003