Kernel: Don't use naked new statements in init process

Instead, try to create the device objects in separate static methods,
and if we fail for some odd reason to allocate memory for such devices,
just panic with that reason.

Kernel/Devices/MemoryDevice.cpp

@@ -8,11 +8,17 @@
 #include <AK/Memory.h>
 #include <AK/StdLibExtras.h>
 #include <Kernel/Arch/PC/BIOS.h>
+#include <Kernel/Panic.h>
 #include <Kernel/VM/AnonymousVMObject.h>
 #include <Kernel/VM/TypedMapping.h>
 
 namespace Kernel {
 
+UNMAP_AFTER_INIT NonnullRefPtr<MemoryDevice> MemoryDevice::must_create()
+{
+    return adopt_ref_if_nonnull(new MemoryDevice).release_nonnull();
+}
+
 UNMAP_AFTER_INIT MemoryDevice::MemoryDevice()
     : CharacterDevice(1, 1)
 {