strat: split out common functionality for future meso use

stratosphere/boot/source/boot_rtc_driver.cpp

@@ -13,10 +13,6 @@
  * 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 <switch.h>
-#include <stratosphere.hpp>
-
 #include "boot_rtc_driver.hpp"
 
 namespace ams::boot {