lib/igt_fb: Add helper function for tile_to_mod

igt_get_fb_tile_size function takes modifer as an argument
This helper function will let users to convert tiling to
modifier and use igt_get_fb_tile_size()

v2: Improved code comment (Paulo)
v3 (from Paulo): Simple rebase.

Reviewed-by: Paulo Zanoni <paulo.r.zanoni@intel.com>
Signed-off-by: Praveen Paneri <praveen.paneri@intel.com>
Signed-off-by: Paulo Zanoni <paulo.r.zanoni@intel.com>
2 files changed