strat: split out common functionality for future meso use

stratosphere/libstratosphere/source/boot2/boot2_api.cpp

@@ -13,13 +13,8 @@
  * You should have received a copy of the GNU General Public License
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
-
-#include <cctype>
 #include <dirent.h>
-#include <stratosphere/cfg.hpp>
-#include <stratosphere/ldr.hpp>
-#include <stratosphere/pm.hpp>
-#include <stratosphere/boot2.hpp>
+#include <stratosphere.hpp>
 
 namespace ams::boot2 {