mfd: ipaq-micro: Add missing break for the default case

Even default case should have a break statement to make code robust
against changes (e.g., adding a case after the default one).

Add missing break for the default case.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Link: https://lore.kernel.org/r/20241016130023.872277-1-andriy.shevchenko@linux.intel.com


Signed-off-by: Lee Jones <lee@kernel.org>