Fix ApplePencilSupport OptionSet raw values to use non-overlapping bits

The firstGenerationUsbC raw value (0x03) overlapped with firstGeneration
(0x01) and secondGeneration (0x02), causing contains() checks to return
incorrect results. Changed to proper power-of-2 values.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: Zandor300

CHANGELOG.md

@@ -22,6 +22,7 @@
 
 - Fixed iPhone Air incorrectly marked as having ultra-wide camera. ([#463](https://github.com/devicekit/DeviceKit/pull/463))
 - Fixed Apple Pencil compatibility for M4 iPad Pro, M2/M3 iPad Air, iPad (10th gen), and iPad (A16) models. ([#474](https://github.com/devicekit/DeviceKit/pull/474))
+- Fixed `ApplePencilSupport` OptionSet raw values so that `.firstGenerationUsbC` no longer incorrectly overlaps with `.firstGeneration` and `.secondGeneration`. ([#474](https://github.com/devicekit/DeviceKit/pull/474))
 - Exclude unhandled files (`Info.plist`, `Device.swift.gyb`) to suppress SPM warnings. ([#484](https://github.com/devicekit/DeviceKit/pull/484))
 
 ## Version 5.7.0