[RFCLAT#11] remove libnetd_client_headers and netid_client.h am: 935a5ee67c am: 45feb24fd7 am: 76002eaeee

Original change: https://android-review.googlesource.com/c/platform/external/android-clat/+/1925759

Change-Id: Ibbaa644c7a5b901be441246279e4e1db8df606d7