Define init_second_stage.recovery

By removing `recovery_available` property from "init_second_stage"
and defining a dedicated recovery-specific module for
"init_second_stage". `recovery_available` property should be used
to allow the reverse dependencies recovery modules to depend on
the module, not to install the module to the recovery partition.

Test: m soong_generated_recovery_filesystem_test
Bug: 381888358
Change-Id: Ie9b93b8453bc1e40f7a28e57f498313d3bc4cedb