GPU Calc: implement fix for DURATION_ADD

AMLOEXT-121 FIX

Change-Id: Ie6b10eacc4e5fc0b2dcfe816982836b8b244af05
Signed-off-by: haochen <haochen@multicorewareinc.com>
Signed-off-by: I-Jui (Ray) Sung <ray@multicorewareinc.com>
GPU Calc: unit test cases for DURATION_ADD

Need open macro NO_FALLBACK_TO_SWINTERP in formulagroupcl.cxx for test

AMLOEXT-121 BUG

Change-Id: Id78c89f77cdfe14d368831c22ff708b968e8fee2
Signed-off-by: haochen <haochen@multicorewareinc.com>
Signed-off-by: I-Jui (Ray) Sung <ray@multicorewareinc.com>