Move optical sensor code to drivers folder (#13044)

drivers/sensors/adns9800.h

@@ -0,0 +1,35 @@
+/* Copyright 2020 Alexander Tulloh
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#pragma once
+
+#include <stdint.h>
+
+typedef struct {
+    /* 200 - 8200 CPI supported */
+    uint16_t cpi;
+} config_adns_t;
+
+typedef struct {
+    int16_t x;
+    int16_t y;
+} report_adns_t;
+
+void adns_init(void);
+config_adns_t adns_get_config(void);
+void adns_set_config(config_adns_t);
+/* Reads and clears the current delta values on the ADNS sensor */
+report_adns_t adns_get_report(void);