libstrat: namespace remaining non-namespaced code. more new-ipc updates

stratosphere/boot/source/gpio/gpio_utils.cpp

@@ -39,7 +39,7 @@ namespace sts::gpio {
 
         uintptr_t GetBaseAddress() {
             if (!g_initialized_gpio_vaddr) {
-                g_gpio_vaddr = GetIoMapping(PhysicalBase, 0x1000);
+                g_gpio_vaddr = dd::GetIoMapping(PhysicalBase, 0x1000);
                 g_initialized_gpio_vaddr = true;
             }
             return g_gpio_vaddr;