Kernel: Expose device presence in /sys/dev/char and /sys/dev/block

These files are not marked as block devices or character devices so they
are not meant to be used as device nodes. The filenames are formatted to
the pattern "major:minor", but a Userland program need to call the parse
these format and inspect the the major and minor numbers and create the
real device nodes in /dev.

Later on, it might be a good idea to ensure we don't create new
SysFSComponents on the heap for each Device, but rather generate
them only when required (and preferably to not create a SysFSComponent
at all if possible).

Kernel/init.cpp

@@ -182,6 +182,7 @@ extern "C" [[noreturn]] UNMAP_AFTER_INIT void init(BootInfo const& boot_info)
 
     load_kernel_symbol_table();
 
+    SysFSComponentRegistry::initialize();
     ConsoleDevice::initialize();
     s_bsp_processor.initialize(0);
 
@@ -275,7 +276,6 @@ void init_stage2(void*)
     }
 
     // Initialize the PCI Bus as early as possible, for early boot (PCI based) serial logging
-    SysFSComponentRegistry::initialize();
     PCI::initialize();
     PCISerialDevice::detect();