tests/drivers/udc: Switch to native_sim_64

Enable this test which run in native_posix_64 in native_sim_64,
And switch native_posix_64 overlays to native_sim_64.

Signed-off-by: Alberto Escolar Piedras <[email protected]>

Author: aescolar

tests/drivers/udc/boards/native_posix_64.conf renamed to tests/drivers/udc/boards/native_sim_64.conf

@@ -5,4 +5,4 @@ tests:
       - drivers
     platform_allow:
       - nrf52840dk_nrf52840
-      - native_posix_64
+      - native_sim_64