Ensure that when ds_profile is NULL, NATIVE_CPU is selected.

Change-Id: Iab714a296ce0f807b5badd1ff96a99f3da2b24f8
Set default cell style directly, without UNO API.

This also avoids unnecessary row height adjustments.

Change-Id: Icfecf0a5fdf7ef18db368ebadcf9d0b8700c0b65