anv/pipeline/gen7: Set multisample modes

anv/pipeline/gen7: Set multisample modes

Fixes the following failures :

dEQP-VK.api.copy_and_blit.resolve_image.whole_4_bit
dEQP-VK.api.copy_and_blit.resolve_image.whole_8_bit
dEQP-VK.api.copy_and_blit.resolve_image.partial_4_bit
dEQP-VK.api.copy_and_blit.resolve_image.partial_8_bit
dEQP-VK.api.copy_and_blit.resolve_image.with_regions_4_bit
dEQP-VK.api.copy_and_blit.resolve_image.with_regions_8_bit

Tested on IVB/HSW

Signed-off-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
Reviewed-by: Anuj Phogat <anuj.phogat@gmail.com>
Reviewed-by: Jason Ekstrand <jason@jlekstrand.net>