[http://forum.unity3d.com/threads/200979-Samsung-Galaxy-Tab-3-10-Device-Not-Supported-Armv7a-Binaries-not-supported][1]
Sorry, don't think you can do this in Unity as it only supports ARM7.
Try exporting to eclipse. In Eclipse Android SDK manager enable the Intel x86 Atom System Image for your required API and try building from there.
[1]: http://forum.unity3d.com/threads/200979-Samsung-Galaxy-Tab-3-10-Device-Not-Supported-Armv7a-Binaries-not-supported
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