Related to #189
Update `configMTIMECMP_BASE_ADDRESS` to be stored in a 64-bit integer.
* Change the type of `ullMachineTimerCompareRegisterBase` to `uint64_t` in `portable/GCC/RISC-V/port.c`.
* Change the type of `ullMachineTimerCompareRegisterBase` to `uint64_t` in `portable/IAR/RISC-V/port.c`.
* Update the initialization of `ullMachineTimerCompareRegisterBase` to use `configMTIMECMP_BASE_ADDRESS` in both files.
Co-authored-by: Gaurav-Aggarwal-AWS <33462878+aggarg@users.noreply.github.com>
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