drm: remove drm_vblank_no_hw_counter assignment from driver code

Core code already makes drm_driver.get_vblank_counter hook optional by
letting drm_vblank_no_hw_counter be the default implementation for the
function hook.  So the drm_vblank_no_hw_counter assignment in the driver
code becomes redundant and can be removed now.

Signed-off-by: Shawn Guo <[email protected]>
Cc: Alexey Brodkin <[email protected]>
Cc: Liviu Dudau <[email protected]>
Cc: Mali DP Maintainers <[email protected]>
Cc: Russell King <[email protected]>
Cc: Boris Brezillon <[email protected]>
Cc: Inki Dae <[email protected]>
Cc: Stefan Agner <[email protected]>
Cc: Xinliang Liu <[email protected]>
Cc: Daniel Vetter <[email protected]>
Cc: Philipp Zabel <[email protected]>
Cc: CK Hu <[email protected]>
Cc: Neil Armstrong <[email protected]>
Cc: Rob Clark <[email protected]>
Cc: Marek Vasut <[email protected]>
Cc: Ben Skeggs <[email protected]>
Cc: Tomi Valkeinen <[email protected]>
Cc: Laurent Pinchart <[email protected]>
Cc: Mark Yao <[email protected]>
Cc: Benjamin Gaignard <[email protected]>
Cc: Maxime Ripard <[email protected]>
Cc: Jyri Sarha <[email protected]>
Cc: Eric Anholt <[email protected]>
Acked-by: Maxime Ripard <[email protected]>
Acked-by: Boris Brezillon <[email protected]>
Acked-by: Neil Armstrong <[email protected]>
Acked-by: Russell King <[email protected]>
Reviewed-by: Laurent Pinchart <[email protected]>
Acked-by: Alexey Brodkin <[email protected]>
Acked-by: Liviu Dudau <[email protected]>
Signed-off-by: Daniel Vetter <[email protected]>
Link: http://patchwork.freedesktop.org/patch/msgid/[email protected]

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