Updated PX4 use / API of low level GPIO and other hardware-centric system facilities

src/drivers/srf02/srf02.cpp

@@ -430,14 +430,14 @@ SRF02::ioctl(struct file *filp, int cmd, unsigned long arg)
 				return -EINVAL;
 			}
 
-			irqstate_t flags = irqsave();
+			irqstate_t flags = px4_enter_critical_section();
 
 			if (!_reports->resize(arg)) {
-				irqrestore(flags);
+				px4_leave_critical_section(flags);
 				return -ENOMEM;
 			}
 
-			irqrestore(flags);
+			px4_leave_critical_section(flags);
 
 			return OK;
 		}