tests/subsys/input/*: Switch to native_sim

Switch from native_posix to native_sim as default test platform
And switch overlays to native_sim.

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

tests/subsys/input/input_longpress/boards/native_sim_64.overlay

@@ -3,4 +3,4 @@
  *
  * SPDX-License-Identifier: Apache-2.0
  */
-#include "native_posix.overlay"
+#include "native_sim.overlay"

tests/subsys/input/input_longpress/testcase.yaml

@@ -3,10 +3,10 @@
 tests:
   input.input_longpress:
     platform_allow:
-      - native_posix
-      - native_posix_64
+      - native_sim
+      - native_sim_64
     tags:
       - drivers
       - input
     integration_platforms:
-      - native_posix
+      - native_sim

tests/subsys/input/input_shell/testcase.yaml

@@ -6,6 +6,10 @@ tests:
     platform_allow:
       - native_posix
       - native_posix_64
+      - native_sim
+      - native_sim_64
+    integration_platforms:
+      - native_sim
     harness: console
     harness_config:
       type: multi_line