Added missing shiftIn function (cherry picked from commit 97af45889ced098cae6ac43f38397b8f6126d57d)
Added missing shiftIn function
(cherry picked from commit 97af45889ced098cae6ac43f38397b8f6126d57d)

jaehong/Xmegaduino,jaehong/Xmegaduino,jaehong/Xmegaduino,jaehong/Xmegaduino,jaehong/Xmegaduino,jaehong/Xmegaduino,jaehong/Xmegaduino