media: atomisp: Fix sh_css_config_input_network_2400() coding style

media: atomisp: Fix sh_css_config_input_network_2400() coding style

Fix the if (stream->config.mode == IA_CSS_INPUT_MODE_PRBS) {} block
coding style. Specifically fix the weird declaration of variables split
over multiple lines.

While at it also split the multi-line width calculation at a more
logical place.

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