I tried with my CY8CKIT-044 (CY8C4247AZI-M485).
The schematic was
Then in the Workspace Explorer, ADC_SAR_Seq_1_IRQ folder was generated
along with the ADC_SAR_Seq_1 folder.
When I opened the ADC_SAR_Seq_1_IRQ.h
There are functions
/* Interrupt Controller API. */
void ADC_SAR_Seq_1_IRQ_StartEx(cyisraddress address);
So, I hope that you can use ADC_SAR_Seq_1_IRQ_Stop() to stop its interrupt.
Note: The name of function changes according to the name of your ADC component.