media: ti-vpe: cal: Replace hardcoded BIT() value with macro

Replace the hardcoded BIT(3) value with CAL_CSI2_PPI_CTRL_FRAME_MASK to
increase readability.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Benoit Parrot <bparrot@ti.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>