Wreorder: Fixed a subset of reorder errors

This commit addresses warnings emitted from -Wreorder
in the C++ src.

Signed-off-by: Noel Eck <noel.eck@intel.com>

src/mpu9150/mpu9150.cxx

@@ -32,7 +32,7 @@ using namespace upm;
 using namespace std;
 
 MPU9150::MPU9150 (int bus, int address, int magAddress, bool enableAk8975) :
-  m_mag(0), MPU60X0(bus, address)
+  MPU60X0(bus, address), m_mag(0)
 {
   m_magAddress = magAddress;
   m_i2cBus = bus;