anv: report timestampComputeAndGraphics true

Spec says :

   "timestampComputeAndGraphics specifies support for timestamps on all
    graphics and compute queues. If this limit is set to VK_TRUE, all
    queues that advertise the VK_QUEUE_GRAPHICS_BIT or
    VK_QUEUE_COMPUTE_BIT in the VkQueueFamilyProperties::queueFlags
    support VkQueueFamilyProperties::timestampValidBits of at least 36."

On gen7+ this should be true (we only have 32bits of timestamp on
gen6 and below).

Signed-off-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
Fixes: 802f0021 ("anv/device: Update features and limits")
Reported-by: Timothy Strelchun <timothy.strelchun@intel.com>
Reviewed-by: Jason Ekstrand <jason@jlekstrand.net>
(cherry picked from commit ce4c5474)