drm/amdkfd: move CoherentHostAccess prop to HSA_CAPABILITY

CoherentHostAccess flag support has moved from HSA_MEMORYPROPERTY
to HSA_CAPABILITY struct. Proper changes have made also at the thunk
to support this change.

CoherentHostAccess: whether or not device memory can be coherently
accessed by the host CPU.

Signed-off-by: Alex Sierra <alex.sierra@amd.com>
Reviewed-by: Felix Kuehling <Felix.Kuehling@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>