MM: Fix uninitialized fileds in segment structure.
MM: Fix uninitialized fileds in segment structure.

shssf/ucx,sergsagal1/ucx_rocm,sergsagal1/ucx_rocm,abouteiller/ucx,abouteiller/ucx,abouteiller/ucx,shssf/ucx,shssf/ucx,abouteiller/ucx,sergsagal1/ucx_rocm