Solved
ffconf.h is missing in stm32CubeMX generated code. STM32G0B0RE
I created new project using CubeMX and selected USB Host and FATFS. but ffconf.h is missing in the project it is giving error.
I treid to copy from STM32F769 example project but function is missing.
retFATFS = FATFS_LinkDriver(&FATFS_Driver, FATFSPath); in fatfs.c
this also missing - app_fatfs.h
