Remove 'vendor_available: false'

'vendor_available: false' is used for VNDK-private libraries that
creates the vendor variants without allowing direct dependency from
the modules in vendor partition.
If the modules are not allowed to be used from any vendor modules, we
must not define this property.

Test: build
Change-Id: I723c1fc62382793f2e16d33d7167010644adca8e
1 file changed