Delete unneeded filegroup

The libui_host_common file group was created to be able to include
certain files from libui into a host build without having to make the
entire library host compatible. This is exactly what libui-types has
done, so that can be used instead of this filegroup.

Bug: 322360037
Test: build libhostgraphics
Change-Id: I6b347980d393b48afddfc97058ab189811e2e640