test: drivers: counter: Test passes even when no instances are found

[albertofloyd]

Describe the bug
Test count iterates over each counter instance and perform the test, however if no instances are found test suite is indicated as pass.

To Reproduce
Steps to reproduce the behavior:

1. cd tests/drivers/counter/counter_basic_api
2. Add following change into tests/drivers/counter/counter_basic_api/src/test_counter.c

@@ -146,6 +146,7 @@ static void counter_tear_down_instance(const char *dev_name)
static void test_all_instances(counter_test_func_t func,
counter_capability_func_t capability_check)
{

•   TC_PRINT("%s. Test %d instances", __func__, ARRAY_SIZE(devices));
    for (int i = 0; i < ARRAY_SIZE(devices); i++) {
            counter_setup_instance(devices[i]);
            if ((capability_check == NULL) ||
  

2. west build -c -p always -b mec172xevb_assy6906
3. west flash
4. Check output. See log below

Expected behavior
If instances are not found, test should fail

Impact
Low test coverage for counter drivers when getting enabled

Logs and console output

Running TESTSUITE test_counter
===================================================================
START - test_set_top_value_with_alarm
test_all_instances. Test 0 devices PASS - test_set_top_value_with_alarm in 0.3 second

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