Kernel/Storage: Move ATA device signature definitions to a general file

Author: https://github.com/supercomputer7
Commit: 7719ef3a61
Pull-request: https://github.com/SerenityOS/serenity/pull/11081
Reviewed-by: https://github.com/Panky-codes
Reviewed-by: https://github.com/linusg ✅

Kernel/Storage/ATA/Definitions.h

@@ -6,6 +6,17 @@
 
 #pragma once
 
+namespace Kernel::ATA {
+
+enum DeviceSignature : u32 {
+    ATA = 0x00000101,
+    ATAPI = 0xEB140101,
+    EnclosureManagementBridge = 0xC33C0101,
+    PortMultiplier = 0x96690101,
+    Unconnected = 0xFFFFFFFF
+};
+}
+
 #define ATA_SR_BSY 0x80
 #define ATA_SR_DRDY 0x40
 #define ATA_SR_DF 0x20