samples: subsys: updatehub: remove PSA overlay and test case

Updatehub now only use PSA Crypto API for crypto support and it
automatically enables Mbed TLS when TF-M is not available in the build,
so there is no need for neither a specific test case for PSA nor
the overlay file.

Signed-off-by: Valerio Setti <[email protected]>

Author: valeriosetti

samples/subsys/mgmt/updatehub/overlay-psa.conf

@@ -19,13 +19,6 @@ tests:
       - CONFIG_UPDATEHUB_POLL_INTERVAL=1
       - CONFIG_UPDATEHUB_CE=y
       - CONFIG_UPDATEHUB_SERVER="updatehub.io"
-  sample.net.updatehub.psa:
-    extra_args: EXTRA_CONF_FILE="overlay-psa.conf"
-    extra_configs:
-      - CONFIG_UPDATEHUB_PRODUCT_UID="e4d37cfe6ec48a2d069cc0bbb8b078677e9a0d8df3a027c4d8ea131130c4265f"
-      - CONFIG_UPDATEHUB_POLL_INTERVAL=1
-      - CONFIG_UPDATEHUB_CE=y
-      - CONFIG_UPDATEHUB_SERVER="updatehub.io"
   sample.net.updatehub.userspace:
     extra_configs:
       - CONFIG_UPDATEHUB_PRODUCT_UID="e4d37cfe6ec48a2d069cc0bbb8b078677e9a0d8df3a027c4d8ea131130c4265f"