Populate MinimumVersion property
The Minimum Version is now an available D-Bus interface:
```
https://gerrit.openbmc.org/c/openbmc/phosphor-dbus-interfaces/+/70110
```
Populate its value if it's being defined.
Tested: If the msl meson options are defined, the D-Bus property is
populated with the value of the defined minimum version:
```
root@witherspoon:~# busctl get-property xyz.openbmc_project.Software.BMC.Updater /xyz/openbmc_project/software xyz.openbmc_project.Software.MinimumVersion MinimumVersion
s "2.15.0"
```
Change-Id: I0f9df0cfd7c06794df836e161b3416094a8535de
Signed-off-by: Adriana Kobylak <anoo@us.ibm.com>
diff --git a/msl_verify.hpp b/msl_verify.hpp
index af0c2a2..086c999 100644
--- a/msl_verify.hpp
+++ b/msl_verify.hpp
@@ -38,4 +38,14 @@
*/
int compare(const Version& a, const Version& b);
+/** @brief Check if the minimum ship level option is enabled
+ * @return true if enabled, false otherwise
+ */
+bool enabled();
+
+/** @brief Get the minimum version
+ * @return[out] msl - Minimum version string
+ */
+std::string getMinimumVersion();
+
} // namespace minimum_ship_level