Inline contents from embedded.mk in uml.

embedded.mk is being deleted, so inline its contents in uml.mk
which is one of the only two targets inheriting it.

Bug: 80410283
Test: diff products variables with multiproduct_kati
Change-Id: I620296cfa62ed8b6fcab3264eb1d42799263e5e2
Merged-In: I620296cfa62ed8b6fcab3264eb1d42799263e5e2