leds: pca955x: Revert "Add ACPI support"

There is no evidence of officially registered ACPI IDs for these devices.
Thus, revert commit 44b3e31d.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Jacek Anaszewski <jacek.anaszewski@gmail.com>