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/nrf24l01/nrf24l01.cxx

@@ -35,7 +35,7 @@ using namespace upm;
 
 
 NRF24L01::NRF24L01 (uint8_t cs, uint8_t ce)
-                            : m_csnPinCtx(cs), m_cePinCtx(ce), m_spi(0)
+                            :m_spi(0), m_csnPinCtx(cs), m_cePinCtx(ce)
 {
     init (cs, ce);
 }