tests: bsim: Bluetooth: Mesh: Adjust timeout for Adv Extensions use

Adjust mesh test timing and timeout value for Advertising
Extensions use/fix in Zephyr Controller. The scanning in
Zephyr Controller is delayed when using extended scanning.

Signed-off-by: Vinayak Kariappa Chettimada <vich@nordicsemi.no>
(cherry picked from commit d1e4c17e6dd43a623ba9396f1e427fb7959b3a44)
diff --git a/tests/bsim/bluetooth/mesh/src/test_beacon.c b/tests/bsim/bluetooth/mesh/src/test_beacon.c
index fd2477f..38432b1 100644
--- a/tests/bsim/bluetooth/mesh/src/test_beacon.c
+++ b/tests/bsim/bluetooth/mesh/src/test_beacon.c
@@ -1331,7 +1331,7 @@
 	ASSERT_TRUE(status == STATUS_SUCCESS);
 	ASSERT_TRUE(phase == BT_MESH_KR_PHASE_2);
 
-	k_sleep(K_SECONDS(BEACON_INTERVAL + 5));
+	k_sleep(K_SECONDS(BEACON_INTERVAL + 7));
 	toggle_priv_beacon(tx_cfg.addr, 1);
 
 	PASS();
diff --git a/tests/bsim/bluetooth/mesh/src/test_provision.c b/tests/bsim/bluetooth/mesh/src/test_provision.c
index 5425874..454792a 100644
--- a/tests/bsim/bluetooth/mesh/src/test_provision.c
+++ b/tests/bsim/bluetooth/mesh/src/test_provision.c
@@ -1008,11 +1008,11 @@
 	/* scanning device with dev index 3 */
 	uuid[6] = '0' + 3;
 	uuid_to_provision_remote = uuid;
-	ASSERT_OK(bt_mesh_rpr_scan_start(&rpr_cli, &srv, uuid, 5, 1, &scan_status));
+	ASSERT_OK(bt_mesh_rpr_scan_start(&rpr_cli, &srv, uuid, 15, 1, &scan_status));
 	ASSERT_EQUAL(BT_MESH_RPR_SUCCESS, scan_status.status);
 	ASSERT_EQUAL(BT_MESH_RPR_SCAN_SINGLE, scan_status.scan);
 	ASSERT_EQUAL(1, scan_status.max_devs);
-	ASSERT_EQUAL(5, scan_status.timeout);
+	ASSERT_EQUAL(15, scan_status.timeout);
 
 	ASSERT_OK(k_sem_take(&scan_sem, K_SECONDS(20)));
 	ASSERT_OK(k_sem_take(&prov_sem, K_SECONDS(20)));