Paulo Zanoni cf9f48e704 lib: add igt_draw
For all those IGT tests that need an easy way to draw rectangles on
buffers using different methods. Current planned users: FBC and PSR
CRC tests.

There is also a tests/kms_draw_crc program to check if the library is
sane.

v2: - Move the test from lib/tests to tests/ (Daniel).
    - Add igt_require() to filter out the swizzling/tiling methods we
      don't support (Daniel).
    - Simplify reloc handling on the BLT case (Daniel).
    - Document enum igt_draw_method (Daniel).
    - Document igt_draw_get_method_name() (Paulo).
v3: - Add IGT_DRAW_MMAP_WC (Chris).
    - Implement the other trivial swizzling methods (Chris).
    - Remove the gem_sync() calls (Chris).

Signed-off-by: Paulo Zanoni <paulo.r.zanoni@intel.com>
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