Add autofocus parameters to android_tutorial_camera

[SemvandenBroek]

This pull request adds much needed autofocus capabilities to the android_tutorial_camera application. On most Android phone camera's this is needed to get good close range focus on the main camera.

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[SemvandenBroek]

Signed the CLA

[googlebot]

CLAs look good, thanks!

[adamantivm]

awesome, thanks!