[l1] PWR: fix style for common code

Code added for L1 to support the PWR Control block didn't properly
follow the HACKING_COMMON_DOC guidelines.  The naming was wrong, and
some headers were missing.  This commit has no functional changes, it
only addresses the style and structure problems.

include/libopencm3/stm32/f1/pwr.h

@@ -0,0 +1,40 @@
+/** @defgroup pwr_defines PWR Defines
+
+@brief <b>Defined Constants and Types for the STM32F1xx PWR Control</b>
+
+@ingroup STM32F1xx_defines
+
+@version 1.0.0
+
+@author @htmlonly &copy; @endhtmlonly 2012 Ken Sarkies <ksarkies@internode.on.net>
+
+@date 5 December 2012
+
+LGPL License Terms @ref lgpl_license
+ */
+
+/*
+ * This file is part of the libopencm3 project.
+ *
+ * This library is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this library.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef LIBOPENCM3_PWR_H
+#define LIBOPENCM3_PWR_H
+
+#include <libopencm3/stm32/memorymap.h>
+#include <libopencm3/stm32/common/pwr_common_all.h>
+
+#endif
+