i2c: spacemit: drop IRQF_ONESHOT flag from IRQ request

i2c: spacemit: drop IRQF_ONESHOT flag from IRQ request

In commit aef30c8d569c ("genirq: Warn about using IRQF_ONESHOT without a
threaded handler")[1], it will check IRQF_ONESHOT flag in IRQ request,
and gives a warning if there is no threaded handler. Drop this flag to
fix this warning.

Link: https://lore.kernel.org/r/20260112134013.eQWyReHR@linutronix.de/
Fixes: 5ea558473fa3 ("i2c: spacemit: add support for SpacemiT K1 SoC")
Signed-off-by: Yixun Lan <dlan@kernel.org>
Cc: <stable@vger.kernel.org> # v6.15+
Reviewed-by: Javier Martinez Canillas <javierm@redhat.com>
Reviewed-by: Troy Mitchell <troy.mitchell@linux.spacemit.com>
Signed-off-by: Andi Shyti <andi.shyti@kernel.org>
Link: https://lore.kernel.org/r/20260122-05-k1-i2c-irq-v1-1-9b8d94bbcd22@kernel.org