strat: split out common functionality for future meso use

stratosphere/boot/source/boot_power_utils.cpp

@@ -13,11 +13,7 @@
  * 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 <strings.h>
-
+#pragma once
 #include "boot_power_utils.hpp"
 #include "fusee-primary_bin.h"