added cpp i/f for new SPI driver. Matching git tag:     imageon d21cd9b35742a985bb52f4e06a0942c2db1c6a83
added cpp i/f for new SPI driver.
Matching git tag:
    imageon d21cd9b35742a985bb52f4e06a0942c2db1c6a83

chenm001/connectal,csail-csg/connectal,8l/connectal,hanw/connectal,csail-csg/connectal,chenm001/connectal,hanw/connectal,chenm001/connectal,chenm001/connectal,cambridgehackers/connectal,8l/connectal,csail-csg/connectal,8l/connectal,cambridgehackers/connectal,cambridgehackers/connectal,csail-csg/connectal,cambridgehackers/connectal,8l/connectal,hanw/connectal,chenm001/connectal,hanw/connectal,8l/connectal,csail-csg/connectal,cambridgehackers/connectal,hanw/connectal