Fix SITL CPU (#4657)

* accelsim: add debug output like in gyrosim

* DriverFramework: update submodule

This brings lower CPU usage because of scheduling in us instead of ms.

src/lib/DriverFramework

@@ -1 +1 @@
-Subproject commit 46e6573cd7eb455881e06a4bf38752156c247475
+Subproject commit 5e055c7d11ec828f59716478c3c5d32c8c1809f0

src/platforms/posix/drivers/accelsim/accelsim.cpp

@@ -802,9 +802,21 @@ ACCELSIM::stop()
 void
 ACCELSIM::_measure()
 {
-	//PX4_INFO("ACCELSIM::_measure");
-	/* status register and data as read back from the device */
+#if 0
+	static int x = 0;
+
+	// Verify the samples are being taken at the expected rate
+	if (x == 99) {
+		x = 0;
+		PX4_INFO("ACCELSIM::measure %" PRIu64, hrt_absolute_time());
 
+	} else {
+		x++;
+	}
+
+#endif
+
+	/* status register and data as read back from the device */
 #pragma pack(push, 1)
 	struct {
 		uint8_t		cmd;