libcgc: Correct the register-index of vPos.x
libcgc: Correct the register-index of vPos.x

Signed-off-by: Erik Faye-Lund <2a8ffc07e8f57d80a2934ccc3dd1949354d82b2d@gmail.com>

digetx/grate,grate-driver/grate,digetx/grate,grate-driver/grate