staging: sync: Add compat_ioctl handlers to sync drivers

The sync drivers are missing compat_ioctl handlers, so this
patch adds them.

The same change has been submitted to AOSP:
        https://android-review.googlesource.com/#/c/54901/


        Change-Id: If1a1ecc3952b321c8d64c6a8b050104859efc4b1

Cc: Erik Gilling <konkers@android.com>
Cc: Dmitry Pervushin <dmitry.pervushin@linaro.org>
Cc: Bernhard Rosenkränzer <Bernhard.Rosenkranzer@linaro.org>
Cc: Android Kernel Team <kernel-team@android.com>
Signed-off-by: Dmitry Pervushin <dmitry.pervushin@linaro.org>
Signed-off-by: John Stultz <john.stultz@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>