Kernel/Storage: Remove 3 stale methods in AHCIPortHandler class

Author: https://github.com/supercomputer7
Commit: 4169ac4a7b
Pull-request: https://github.com/SerenityOS/serenity/pull/13416
Reviewed-by: https://github.com/IdanHo ✅
Reviewed-by: https://github.com/awesomekling
Reviewed-by: https://github.com/timschumi

Kernel/Storage/ATA/AHCIPortHandler.h

@@ -34,7 +34,6 @@ public:
     static ErrorOr<NonnullRefPtr<AHCIPortHandler>> create(AHCIController&, u8 irq, AHCI::MaskedBitField taken_ports);
     virtual ~AHCIPortHandler() override;
 
-    RefPtr<StorageDevice> device_at_port(size_t port_index) const;
     virtual StringView purpose() const override { return "SATA Port Handler"sv; }
 
     AHCI::HBADefinedCapabilities hba_capabilities() const;
@@ -58,9 +57,6 @@ private:
 
     AHCI::MaskedBitField create_pending_ports_interrupts_bitfield() const;
 
-    void start_request(AsyncBlockDeviceRequest&, bool, bool, u16);
-    void complete_current_request(AsyncDeviceRequest::RequestResult);
-
     void enumerate_ports(Function<void(AHCIPort const&)> callback) const;
     RefPtr<AHCIPort> port_at_index(u32 port_index) const;