drm/i915: correct the pitch check for NV12 framebuffer

framebuffer for NV12 requires the pitch to the multiplier of 4, instead
of the width. This patch corrects it.

For instance, a 480p video, whose width and pitch are 854 and 896
respectively, is excluded for NV12 plane so far.

Changes since v1:
    - Removed check for NV12 buffer dimensions since additional checks
      are done for viewport size in intel_sprite.c

Signed-off-by: Dongseong Hwang <[email protected]>
Signed-off-by: P Raviraj Sitaram <[email protected]>
Cc: Chandra Konduru <[email protected]>
Cc: Vidya Srinivas <[email protected]>
Cc: Ville Syrjälä <[email protected]>
Cc: Juha-Pekka Heikkila <[email protected]>
Signed-off-by: Ville Syrjälä <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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