media: atomisp: Drop MRFLD_PORT_NUM define

The info in the MRFLD_PORT_NUM define is duplicate with
the ATOMISP_CAMERA_NR_PORTS and N_MIPI_PORT_ID enum values.

Drop the MRFLD_PORT_NUM define and switch to N_MIPI_PORT_ID
since the [sensor_]lanes arrays are in enum mipi_port_id order.

Link: https://lore.kernel.org/r/20230518153733.195306-2-hdegoede@redhat.com



Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>