media: coda: don't disable IRQs across buffer meta handling

The CODA driver uses threaded IRQs only, so there is nothing happening
in hardirq context that could interfere with the buffer meta handling.

Signed-off-by: Lucas Stach <l.stach@pengutronix.de>
Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>
Signed-off-by: Hans Verkuil <hansverk@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>