Define reboot.recovery and watchdogd.recovery

By removing the "recovery_available" property from "reboot" and
"watchdogd" modules.
"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: I48014774714957885f3ad648ac302cc3c13687ae