HID: cp2112: Remove dead code

Remove cp2112_allocate_irq() and counterparts that seems to be
a dead code from day 1. In case somebody needs it, it can be
retrieved from Git index.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Link: https://lore.kernel.org/r/20230703185222.50554-7-andriy.shevchenko@linux.intel.com


Signed-off-by: Benjamin Tissoires <bentiss@kernel.org>