dmaengine: qcom: gpi: clean up the IRQ disable/enable in gpi_reset_chan()

The calls write_lock/unlock_irq() disables and re-enables the IRQs.
Calling spin_lock_irqsave() and spin_lock_restore() when the IRQs are
already disabled doesn't do anything and just makes the code confusing.

Signed-off-by: Dan Carpenter <dan.carpenter@linaro.org>
Link: https://lore.kernel.org/r/8be473eb-65e0-42b4-b574-e61c3a7f62d8@moroto.mountain
Signed-off-by: Vinod Koul <vkoul@kernel.org>