Add DeviceUtils: All credits crdroid. For VolumeSteps[1/2]

Author's original commit including this file:

    https://github.com/cristianomatos/android_frameworks_base/commit/928baf19082a603517823b1ee64b30638330d75a

Change-Id: Ic15cee1ec45b0d3739d2b271e6ba464dd688a217
Merge "Add DeviceUtils: All credits crdroid. For VolumeSteps[1/2]" into pac-4.4