Kernel: Move ACPI to its own directory and namespace

kernel/kernel/Timer/HPET.cpp

@@ -1,5 +1,5 @@
 #include <BAN/ScopeGuard.h>
-#include <kernel/ACPI.h>
+#include <kernel/ACPI/ACPI.h>
 #include <kernel/IDT.h>
 #include <kernel/InterruptController.h>
 #include <kernel/Memory/PageTable.h>
@@ -131,7 +131,7 @@ namespace Kernel
 
 	BAN::ErrorOr<void> HPET::initialize(bool force_pic)
 	{
-		auto* header = static_cast<const ACPI::HPET*>(ACPI::get().get_header("HPET"sv, 0));
+		auto* header = static_cast<const ACPI::HPET*>(ACPI::ACPI::get().get_header("HPET"sv, 0));
 		if (header == nullptr)
 			return BAN::Error::from_errno(ENODEV);