Change directory structure to align with Atmel softpack

This way we can easily check with 'diff' for differences in our code and
Atmel softpack.  Also, this layout is more suitable for building various
different firmware images (e.g. factory-test, dfu-loader, main
application) for a variety of different boards (simtrace, owhw, qmod).

firmware/libboard/qmod/source/wwan_perst.c

@@ -0,0 +1,76 @@
+/* Code to control the PERST lines of attached modems
+ *
+ * Depending on the board this is running on,  it might be possible
+ * for the controller to set the status of the PERST input line of
+ * the cellular modem.  If the board supports this, it sets the
+ * PIN_PERST1 and/or PIN_PERST2 defines in its board.h file.
+ */
+
+#include "board.h"
+#include "wwan_perst.h"
+#include "osmocom/core/timer.h"
+
+#define PERST_DURATION_MS 300
+
+#ifdef PIN_PERST1
+static const Pin pin_perst1 = PIN_PERST1;
+static struct osmo_timer_list perst1_timer;
+#endif
+
+#ifdef PIN_PERST2
+static const Pin pin_perst2 = PIN_PERST2;
+static struct osmo_timer_list perst2_timer;
+#endif
+
+static void perst_tmr_cb(void *data)
+{
+	const Pin *pin = data;
+	/* release the (low-active) reset */
+	PIO_Clear(pin);
+}
+
+int wwan_perst_do_reset(int modem_nr)
+{
+	const Pin *pin;
+	struct osmo_timer_list *tmr;
+
+	switch (modem_nr) {
+#ifdef PIN_PERST1
+	case 1:
+		pin = &pin_perst1;
+		tmr = &perst1_timer;
+		break;
+#endif
+#ifdef PIN_PERST2
+	case 2:
+		pin = &pin_perst2;
+		tmr = &perst2_timer;
+		break;
+#endif
+	default:
+		return -1;
+	}
+	PIO_Set(pin);
+	osmo_timer_schedule(tmr, PERST_DURATION_MS/1000, (PERST_DURATION_MS%1000)*1000);
+
+	return 0;
+}
+
+int wwan_perst_init(void)
+{
+	int num_perst = 0;
+#ifdef PIN_PERST1
+	PIO_Configure(&pin_perst1, 1);
+	perst1_timer.cb = perst_tmr_cb;
+	perst1_timer.data = (void *) &pin_perst1;
+	num_perst++;
+#endif
+
+#ifdef PIN_PERST2
+	PIO_Configure(&pin_perst2, 1);
+	perst2_timer.cb = perst_tmr_cb;
+	perst2_timer.data = (void *) &pin_perst2;
+	num_perst++;
+#endif
+	return num_perst;
+}