tests: lib: spsc_pbuf: Convert to use new ztest API

Convert test to use new API.

Signed-off-by: Krzysztof Chruscinski <[email protected]>

Author: nordic-krch

tests/lib/spsc_pbuf/prj.conf

@@ -1,2 +1,3 @@
 CONFIG_ZTEST=y
+CONFIG_ZTEST_NEW_API=y
 CONFIG_SPSC_PBUF=y

tests/lib/spsc_pbuf/src/main.c

@@ -13,7 +13,7 @@
  */
 static uint8_t memory_area[216] __aligned(4);
 
-static void test_spsc_pbuf_ut(void)
+ZTEST(test_spsc_pbuf, test_spsc_pbuf_ut)
 {
 	static uint8_t rbuf[198];
 	static uint8_t message[20] = {'a'};
@@ -99,10 +99,4 @@ static void test_spsc_pbuf_ut(void)
 	zassert_equal(message[0], 'a', NULL);
 }
 
-void test_main(void)
-{
-	ztest_test_suite(spsc_pbuf,
-			ztest_unit_test(test_spsc_pbuf_ut)
-			);
-	ztest_run_test_suite(spsc_pbuf);
-}
+ZTEST_SUITE(test_spsc_pbuf, NULL, NULL, NULL, NULL, NULL);