drm/i915/selftests: Rename wait_for_hang() to wait_until_running()

Tvrtko mentioned that wait_for_hang() was confusing as it does not
actually wait for the aforementioned hang, just until the request is
running and we are *ready* to inject a hang. A quick
s/wait_for_hang/wait_until_running/ removes that confusion without
having to rethink the naming scheme, immediately at least.

Suggested-by: Tvrtko Ursulin <[email protected]>
Signed-off-by: Chris Wilson <[email protected]>
Cc: Tvrtko Ursulin <[email protected]>
Cc: Mika Kuoppala <[email protected]>
Cc: Michel Thierry <[email protected]>
Reviewed-by: Tvrtko Ursulin <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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