media: atomisp: Remove unused port_enabled variable

Remove unused port_enabled variable in ia_css_isys_rx_configure().

Link: https://lore.kernel.org/linux-media/20210526124322.48915-6-andriy.shevchenko@linux.intel.com


Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>