Emmanuel,
The CSL library is located at "C:\ti\pdk_C6657_x_x_x\packages\ti\csl\lib" as "ti.csl.ae66" and "ti.csl.intc.ae66" for little endian and "ti.csl.ae66e" and "ti.csl.intc.ae66e" for big endian.
One thing to note is previously you are mapping GPIO event to CIC host interrupt 1 and here you are mapping to host interrupt 0.
Not sure if you want to try "params.arg = 0;".
Sorry that I do not have device at my hand this week to debug the code for you. I may try something next week. But it will good if someone else could step in to help as well.