Please refer to the Segger Graphics Library User Guide to understand what files to include based on your application. The terminologies are as follows:
(1) nosnts --> No OS no Touch Screen
(2) nosts --> No OS but supports Touch Screen
(3) osts --> Support both OS and Touch Screen
The same applies to linker files, look at the naming schemes. For ex: libemWin_nosts_cm3_gcc.a.
Now coming to the next part of choosing the driver templates, please refer to the documentation available with the Segger Emwin Package. Once downloaded, it will be available at this path: "emWinGraphics_v5_46\Documentation\PSoC4_5"
In your case, your display controller ILI9341 is supported in GUIDRV_FlexColor as seen below:
So, in the FlexColor directory, the files to choose is again mentioned in the Segger User Guide Page#6:
Whether you want to use RTOS or not is completely your choice. If you aren't familiar with RTOS, then you need not use it.