feat: add support for aarch64 timer/interrupts, port MontaukOS userspace

kernel/src/ACPI/FADT.cpp

@@ -107,6 +107,8 @@ namespace Hal {
             result.AcpiEnable       = fadt->AcpiEnable;
             result.AcpiDisable      = fadt->AcpiDisable;
             result.Flags            = fadt->Flags;
+            result.ArmBootArchFlags = fadt->Header.Length >= offsetof(Table, ArmBootArchFlags) + 2
+                                    ? fadt->ArmBootArchFlags : 0;
             result.Valid            = true;
 
             KernelLogStream(INFO, "FADT") << "DSDT at " << base::hex << result.DsdtAddress;