ztest API Migration: bluetooth/bluetooth

Migrate the unit tests at `bluetooth/bluetooth` to use the new ztest API.

Signed-off-by: Tristan Honscheid <honscheid@google.com>
diff --git a/tests/bluetooth/bluetooth/prj.conf b/tests/bluetooth/bluetooth/prj.conf
index f43d042..2db2bc2 100644
--- a/tests/bluetooth/bluetooth/prj.conf
+++ b/tests/bluetooth/bluetooth/prj.conf
@@ -4,3 +4,4 @@
 CONFIG_BT_DEBUG_LOG=y
 CONFIG_UART_INTERRUPT_DRIVEN=n
 CONFIG_ZTEST=y
+CONFIG_ZTEST_NEW_API=y
diff --git a/tests/bluetooth/bluetooth/src/bluetooth.c b/tests/bluetooth/bluetooth/src/bluetooth.c
index 5d7c7ac..9099d1f 100644
--- a/tests/bluetooth/bluetooth/src/bluetooth.c
+++ b/tests/bluetooth/bluetooth/src/bluetooth.c
@@ -42,18 +42,12 @@
 	bt_hci_driver_register(&drv);
 }
 
-void test_bluetooth_entry(void)
+ZTEST_SUITE(test_bluetooth, NULL, NULL, NULL, NULL, NULL);
+
+ZTEST(test_bluetooth, test_bluetooth_entry)
 {
 	driver_init();
 
 	zassert_true((bt_enable(NULL) == EXPECTED_ERROR),
 			"bt_enable failed");
 }
-
-/*test case main entry*/
-void test_main(void)
-{
-	ztest_test_suite(test_bluetooth,
-			ztest_unit_test(test_bluetooth_entry));
-	ztest_run_test_suite(test_bluetooth);
-}