radv: add fs_key meta format support to resolve passes.

Some of the hw resolve passes need the SPI color format setup
correctly.

This fixes lots of 16-bit and 32-bit format tests in
dEQP-VK.renderpass.suballocation.multisample*

Reviewed-by: Bas Nieuwenhuizen <bas@basnieuwenhuizen.nl>
Fixes: f4e499ec "radv: add initial non-conformant radv vulkan driver"
Signed-off-by: Dave Airlie <airlied@redhat.com>
(cherry picked from commit 316d7621)