ztest API Migration: bluetooth/ll_settings

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

Signed-off-by: Tristan Honscheid <honscheid@google.com>
diff --git a/tests/bluetooth/ll_settings/prj.conf b/tests/bluetooth/ll_settings/prj.conf
index ab13303..eddcfe8 100644
--- a/tests/bluetooth/ll_settings/prj.conf
+++ b/tests/bluetooth/ll_settings/prj.conf
@@ -1,5 +1,6 @@
 CONFIG_TEST=y
 CONFIG_ZTEST=y
+CONFIG_ZTEST_NEW_API=y
 
 CONFIG_BT=y
 CONFIG_BT_CTLR=y
diff --git a/tests/bluetooth/ll_settings/src/main.c b/tests/bluetooth/ll_settings/src/main.c
index 27c6b9c..faf277f 100644
--- a/tests/bluetooth/ll_settings/src/main.c
+++ b/tests/bluetooth/ll_settings/src/main.c
@@ -14,7 +14,9 @@
 
 #include "ll_settings.h"
 
-void test_company_id(void)
+ZTEST_SUITE(test_ll_settings, NULL, NULL, NULL, NULL, NULL);
+
+ZTEST(test_ll_settings, test_company_id)
 {
 	uint16_t cid;
 	int err;
@@ -32,7 +34,7 @@
 		      "Company ID does not match");
 }
 
-void test_subversion_number(void)
+ZTEST(test_ll_settings, test_subversion_number)
 {
 	uint16_t svn;
 	int err;
@@ -49,12 +51,3 @@
 	zassert_equal(ll_settings_subversion_number(), svn,
 		      "Subversion number does not match");
 }
-
-/*test case main entry*/
-void test_main(void)
-{
-	ztest_test_suite(test_ll_settings,
-			 ztest_unit_test(test_company_id),
-			 ztest_unit_test(test_subversion_number));
-	ztest_run_test_suite(test_ll_settings);
-}