serial: pic32_uart: Utilize uart_console_enabled()

The serial core already provides a helper to check if the given port
is an enabled console. Utilize it instead of open coded variant.

Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Link: https://lore.kernel.org/r/20220806225643.40897-1-andriy.shevchenko@linux.intel.com


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>