Specify additional generated partitions for android_device module

Defines vendor_boot, init_boot and recovery partition module name
properties in android_device.

Also, specifies the above properties and boot_partition_name properties
in filesystem_creator when generating android_device module.

Dependency is now added via `AddFarVariationDependencies`, given that
boot images are `MultilibFirst`.

This change also improves the comments of the properties of
android_device module type.

Test: build auto generated android_device module
Change-Id: I5426e28aa355efeda5cb5f140dd82db7ed06b84c