sysclk: code cleanup and fan speed

also fix incompatibility with nx fancontrol

Source/sys-clk/common/src/pwm.c

@@ -0,0 +1,35 @@
+#define NX_SERVICE_ASSUME_NON_DOMAIN
+#include <switch.h>
+#include "service_guard.h"
+#include "pwm.h"
+
+static Service g_pwmSrv;
+
+NX_GENERATE_SERVICE_GUARD(pwm);
+
+Result _pwmInitialize(void) {
+    return smGetService(&g_pwmSrv, "pwm");
+}
+
+void _pwmCleanup(void) {
+    serviceClose(&g_pwmSrv);
+}
+
+Service* pwmGetServiceSession(void) {
+    return &g_pwmSrv;
+}
+
+Result pwmOpenSession2(PwmChannelSession *out, u32 device_code) {
+    return serviceDispatchIn(&g_pwmSrv, 2, device_code,
+        .out_num_objects = 1,
+        .out_objects = &out->s,
+    );
+}
+
+Result pwmChannelSessionGetDutyCycle(PwmChannelSession *c, double* out) {
+    return serviceDispatchOut(&c->s, 7, *out);
+}
+
+void pwmChannelSessionClose(PwmChannelSession *controller) {
+    serviceClose(&controller->s);
+}