intel_th: pci: Enable bus mastering

The driver forgets to enable bus mastering for the PCI device.
Fix this.

Signed-off-by: Alexander Shishkin <alexander.shishkin@linux.intel.com>
diff --git a/drivers/hwtracing/intel_th/pci.c b/drivers/hwtracing/intel_th/pci.c
index 590cf90..aac7d66 100644
--- a/drivers/hwtracing/intel_th/pci.c
+++ b/drivers/hwtracing/intel_th/pci.c
@@ -46,6 +46,8 @@ static int intel_th_pci_probe(struct pci_dev *pdev,
 	if (IS_ERR(th))
 		return PTR_ERR(th);
 
+	pci_set_master(pdev);
+
 	return 0;
 }