beckham: Include missing dependencies for MotoSignature

* Seems to resolve...
  E PackageManager: updateAllSharedLibrariesLPw failed: Package
  com.motorola.motosignature.app requires unavailable shared library
  com.motorola.motosignature; failing!

Change-Id: I8c4cdd9b6471a5dae7f3ec321135e1fb92a47866

proprietary-files.txt

@@ -25,6 +25,8 @@ vendor/lib/motorola.hardware.audio.eqservice@1.0_vendor.so
 
 # Camera
 -app/MotoSignatureApp/MotoSignatureApp.apk;PRESIGNED
+etc/permissions/com.motorola.motosignature.xml
+framework/com.motorola.motosignature.jar
 -priv-app/MotCamera2/MotCamera2.apk;PRESIGNED
 etc/permissions/privapp-permissions-com.motorola.camera2.xml
 etc/zaf/zaf_mot_s5k2l7sa.json:vendor/etc/zaf/zaf_mot_s5k2l7sa.json