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Sstc extension allows to program the timer and receive the interrupt without using an SBI call. This reduces the latency to generate the timer interrupt. So, detect whether Sstc extension is supported and use the stimecmp register directly to program the timer interrupt. Cc: Gerd Hoffmann <kraxel@redhat.com> Cc: Rahul Kumar <rahul1.kumar@intel.com> Cc: Laszlo Ersek <lersek@redhat.com> Cc: Ray Ni <ray.ni@intel.com> Cc: Andrei Warkentin <andrei.warkentin@intel.com> Signed-off-by: Sunil V L <sunilvl@ventanamicro.com> Reviewed-by: Laszlo Ersek <lersek@redhat.com> Reviewed-by: Andrei Warkentin <andrei.warkentin@intel.com> Reviewed-by: Dhaval Sharma <dhaval@rivosinc.com>