CLINT vs mtime in FreeRTOS RISC-V port

kj-lin wrote on Thursday, August 29, 2019:

To make the smallest modifications, I just simply replace configCLINT_BASE_ADDRESS wth configMTIME_BASE_ADDRESS and configMTIMECMP_BASE_ADDRESS defined in FreeRTOSConfig.h file, and also replace portasmHAS_CLINT with portasmHAS_MTIME defined in freertos_risc_v_chip_specific_extensions.h file.
The default timer/tick handling in port.c and portASM.S files are implemented based on the definitions.

The examples are as attached.