drm/i915: Fix various tracepoints for gen2

Gen2 doesn't have a frame counter and apparently we no longer provide
a fake .get_vblank_counter() hook for it. That means all tracepoints
calling that hook will oops. Update the tracepoints to use
intel_crtc_get_vblank_counter() which will gracefully fall back to
using the software counter. This is actually a better approach since
we now get (hopefully accurate) frame numbers in the traces.

This also gets rid of the raw driver->get_vblank_counter() calls, which
we need to do in order to switch to the per-crtc vblank vfuncs.

v2: Deal with new tracepoints
v3: Use a distinct variable name for the internal crtc iterator (Chris)

Cc: Shawn Guo <[email protected]>
Cc: Daniel Vetter <[email protected]>
Fixes: 967dd4841787 ("drm: remove drm_vblank_no_hw_counter assignment from driver code")
Signed-off-by: Ville Syrjälä <[email protected]>
Reviewed-by: Chris Wilson <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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