media: imx: imx7-media-csi: Replace CSICR*_RESET_VAL with values

The CSICR*_RESET_VAL macros only obfuscate code. Use their value
directly, replacing the numerical value with the macros that describe
register bits.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Rui Miguel Silva <rmfrfs@gmail.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>