drm/i915/gt: Use XY_FAST_COLOR_BLT to clear obj on graphics ver 12+

Use faster XY_FAST_COLOR_BLT cmd on graphics version of 12 and more,
for clearing (Zero out) the pages of the newly allocated object.

XY_FAST_COLOR_BLT is faster than the older XY_COLOR_BLT.

v2:
  Typo fix at title [Thomas]
v3:
  XY_FAST_COLOR_BLT is used only for FLAT_CCS capable gen12+

Signed-off-by: Ramalingam C <ramalingam.c@intel.com>
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Thomas Hellstrom <thomas.hellstrom@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220405150840.29351-3-ramalingam.c@intel.com