Enable fast clear rendering on rendercopy function.

v2: Modify _gen9_render_copyfunc to support fast clear (Matt)
    Enable fast clear bit on 3D sequence (Matt)
    Add helper function to figure out clear color modifier (Matt)
v3: Remove unrelated line additions/removes
v4: Fast clear with color (Imre)
v5: Write raw 32-bit color values to register (Imre)
    Require 32-bit color format
v6: Rebase to use batchbuffer without libdrm dependency
v7: Enable clear color (Nanley)
v8: Various cleanups (Imre)
    Modificate buffer creation (Imre)
v9: Renaming of render_copyfunc() to render_op() (Imre)
    Remove igt_render_clearfunc variable (Imre)
v10: Dst buffer width division by 64 pixels and height by 16 lines (Imre)
     Reorder ss10 bit fields (Imre)
     Relocate buffer with clear color value enabled (Imre)
     Set fast clear enable bit in correct dword (Imre)

Signed-off-by: Mika Kahola <mika.kahola@intel.com>
Reviewed-by: Imre Deak <imre.deak@intel.com>