refactor kernel to use device platform discovery

src/device/platform.zig

@@ -21,12 +21,21 @@ pub const DeviceClass = device.DeviceClass;
 pub const Hal = device.Hal;
 pub const PowerInfo = acpi.PowerInfo;
 pub const AmlStats = acpi.AmlStats;
+pub const PlatformInfo = acpi.PlatformInfo;
+pub const RegAccess = acpi.RegAccess;
+pub const IsoEntry = acpi.IsoEntry;
 
 /// The register map + sleep types discovery extracted, for logging/diagnostics.
 pub fn powerInfo() PowerInfo {
     return acpi.power_info;
 }
 
+/// The scalar firmware facts the arch layer needs to avoid legacy assumptions
+/// (8259 presence, LAPIC base, PM timer, SPCR UART, IRQ overrides).
+pub fn platformInfo() PlatformInfo {
+    return acpi.platform_info;
+}
+
 /// AML parse integrity/diagnostics (namespace node count, bytes consumed).
 pub fn amlStats() AmlStats {
     return acpi.aml_stats;