samples/net several: Use hwmv2 native targets identifiers

For the 64 bit targets, change identifiers to the new hwmv2 ones.
And remove redundant overlays (which were equal for the 32
and 64 bit versions)

Signed-off-by: Alberto Escolar Piedras <alberto.escolar.piedras@nordicsemi.no>

samples/net/ipv4_autoconf/sample.yaml

@@ -6,9 +6,9 @@ common:
   platform_allow:
     - qemu_x86
     - native_posix
-    - native_posix_64
+    - native_posix/native/64
     - native_sim
-    - native_sim_64
+    - native_sim/native/64
   integration_platforms:
     - native_sim
 sample:

samples/net/lldp/sample.yaml

@@ -10,9 +10,9 @@ tests:
   sample.net.lldp:
     platform_allow:
       - native_posix
-      - native_posix_64
+      - native_posix/native/64
       - native_sim
-      - native_sim_64
+      - native_sim/native/64
     integration_platforms:
       - native_sim
     depends_on: eth

samples/net/zperf/boards/native_posix_64.conf

@@ -1 +0,0 @@
-CONFIG_NATIVE_POSIX_SLOWDOWN_TO_REAL_TIME=y

samples/net/zperf/sample.yaml

@@ -5,7 +5,7 @@ common:
   # TODO: Does not work properly with native_posix, need more TLC
   platform_exclude:
     - native_posix
-    - native_posix_64
+    - native_posix/native/64
     - sam_e70_xplained/same70q21
   min_ram: 64
 sample: