i2c: ocores: Use read_poll_timeout_atomic to avoid false poll timeouts

i2c: ocores: Use read_poll_timeout_atomic to avoid false poll timeouts

Replace the manual polling loop in ocores_wait() with the kernel helper
read_poll_timeout_atomic(). This simplifies the code and ensures robust
timeout handling.

In particular, the helper guarantees a condition check after the
delay, even if the delay exceeds the timeout, avoiding spurious
timeout errors under load or preemption.

Signed-off-by: Martin Aberer <martin.aberer@bachmann.info>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: Andi Shyti <andi.shyti@kernel.org>
Link: https://lore.kernel.org/r/20260324140556.2249039-1-martin.aberer@bachmann.info