nrf/drivers: Add license text to ticker.h and softpwm.h.

As per the LICENSE and AUTHORS files from the original source of these
header files.

ports/nrf/drivers/softpwm.h

@@ -1,3 +1,36 @@
+/*
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2013-2016 The MicroPython-on-micro:bit Developers:
+ * Damien P. George (@dpgeorge)
+ * Nicholas H. Tollervey (@ntoll)
+ * Matthew Else (@matthewelse)
+ * Alan M. Jackson (@alanmjackson)
+ * Mark Shannon (@markshannon)
+ * Larry Hastings (@larryhastings)
+ * Mariia Koroliuk (@marichkakorolyuk)
+ * Andrew Mulholland (@gbaman)
+ * Joe Glancy (@JoeGlancy)
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
 #ifndef __MICROPY_INCLUDED_LIB_PWM_H__
 #define __MICROPY_INCLUDED_LIB_PWM_H__
 

ports/nrf/drivers/ticker.h

@@ -1,3 +1,36 @@
+/*
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2013-2016 The MicroPython-on-micro:bit Developers:
+ * Damien P. George (@dpgeorge)
+ * Nicholas H. Tollervey (@ntoll)
+ * Matthew Else (@matthewelse)
+ * Alan M. Jackson (@alanmjackson)
+ * Mark Shannon (@markshannon)
+ * Larry Hastings (@larryhastings)
+ * Mariia Koroliuk (@marichkakorolyuk)
+ * Andrew Mulholland (@gbaman)
+ * Joe Glancy (@JoeGlancy)
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
 #ifndef __MICROPY_INCLUDED_LIB_TICKER_H__
 #define __MICROPY_INCLUDED_LIB_TICKER_H__