Change libkeymaster3device to vendor:true

This commit replaces `vendor_available:true` with `vendor:true` because
currently only android.hardware.keymaster@3.0-impl.so depends on
libkeymaster3device.so and system shared libraries are unlikely to
depend on libkeymaster3device.so directly.

Test: Sailfish builds and boots (p.s. there should be no difference
because /vendor/lib[64]/libkeymaster3device is identical).

Change-Id: Ibe0fdd6c5f9f905bfc3110ed87535223e0d3deb1
1 file changed