Add GetXtalkRow to CTestboard class. Helper function to calculate the row to be pulsed with a calibrate signal.
Add GetXtalkRow to CTestboard class. Helper function to calculate the row to
be pulsed with a calibrate signal.

psi46/pixel-dtb-firmware,psi46/pixel-dtb-firmware,simonspa/pixel-dtb-firmware,psi46/pixel-dtb-firmware,simonspa/pixel-dtb-firmware,psi46/pixel-dtb-firmware,psi46/pixel-dtb-firmware,simonspa/pixel-dtb-firmware,simonspa/pixel-dtb-firmware