drm/i915/selftests: Rework context handling in hugepages selftests

In the next commit, we don't evict when refcount = 0, so we need to
call drain freed objects, because we want to pin new bo's in the same
place, causing a test failure.

Furthermore, since each subtest is separated, it's a lot better to use
i915_live_selftests, so each subtest starts with a clean slate, and a
clean address space.

v2(Reported-by: kernel test robot <[email protected]>):
  - Make hugepage_ctx static.

Signed-off-by: Maarten Lankhorst <[email protected]>
Reviewed-by: Matthew Auld <[email protected]>
Signed-off-by: Matthew Auld <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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