[media] omap3isp: Fix kerneldoc for _module_sync_is_stopping and isp_isr()

Use the correct name in the comment describing function
omap3isp_module_sync_is_stopping().

isp_isr() never returned IRQ_NONE, remove the comment saying so.

Signed-off-by: Peter Meerwald <pmeerw@pmeerw.net>
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>