riscv: Correct event usage for riscv_cpu_probe/setup

With having both an EVENT_SPY_SIMPLE setup for both riscv_cpu_probe and
riscv_cpu_setup we do not need the latter function to call the former
function as it will already have been done in time.

Fixes: 1c55d62f ("riscv: cpu: make riscv_cpu_probe to EVT_DM_POST_INIT_R callback")
Signed-off-by: Tom Rini <trini@konsulko.com>
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Cc: Rick Chen <rick@andestech.com>
Cc: Leo Yu-Chi Liang  <ycliang@andestech.com>
Cc: Simon Glass <sjg@chromium.org>
Cc: Nikita Shubin <n.shubin@yadro.com>
Cc: Chanho Park <chanho61.park@samsung.com>
Cc: Yu Chien Peter Lin <peterlin@andestech.com>