riscv: Split out measure_cycles() for reuse

Byte cycle measurement and word cycle measurement of scalar misaligned
access are very similar. Split these parts out into a common
measure_cycles() function to avoid duplication.

This function will also be reused for vector misaligned access probe in a
follow-up commit.

Signed-off-by: Nam Cao <namcao@linutronix.de>
Link: https://patch.msgid.link/50d0598e45acc56c95176e52fbbe56e1f4becc84.1770830596.git.namcao@linutronix.de
Signed-off-by: Paul Walmsley <pjw@kernel.org>

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