Keep RECOVERY_API_VERSION and RECOVERY_FSTAB_VERSION in sync.

`RECOVERY_API_VERSION` and `RECOVERY_FSTAB_VERSION` were previously
only used in `build/core/Makefile`, and other places manually
maintained synchronization using hardcoded values. This change uses
corresponding `soong_config_variables` to keep them synchronized and
avoid errors.

Bug: 339143524
Test: m misc_info
Change-Id: I137ece41ebb1039f6069e0a8a6c8b0d74412e8d8