Revert "test: set uart log level to INFO for DMA tests"

This reverts commit b05cbcbc24.

artiq/test/coredevice/test_rtio.py

@@ -652,18 +652,6 @@ class _DMA(EnvExperiment):
 
 
 class DMATest(ExperimentCase):
-    def setUp(self):
-        super().setUp()
-        # prevent DEBUG log messages causing delay for DMA
-        core_addr = self.device_mgr.get_desc("core")["arguments"]["host"]
-        self.mgmt = CommMgmt(core_addr)
-        self.mgmt.set_uart_log_level('INFO')
-
-    def tearDown(self):
-        self.mgmt.set_uart_log_level('DEBUG')
-        self.mgmt.close()
-        super().tearDown()
-
     def test_dma_storage(self):
         exp = self.create(_DMA)
         exp.record()