Undo some changes exposing unused functions

src/core/gdbstub/gdbstub.h

@@ -111,25 +111,11 @@ void SetCpuStepFlag(bool is_step);
 void SendTrap(Kernel::Thread* thread, int trap);
 
 /**
+u32 HexToInt(const u8* src, std::size_t len) {
  * Converts input hex string characters into an array of equivalent of u8 bytes.
  *
  * @param src Pointer to array of output hex string characters.
  * @param len Length of src array.
  */
 u32 HexToInt(const u8* src, std::size_t len);
-
-/**
- * Convert a gdb-formatted hex string into a u32.
- *
- * @param src Pointer to hex string.
- */
-u32 GdbHexToInt(const u8* src);
-
-/**
- * Convert a gdb-formatted hex string into a u64.
- *
- * @param src Pointer to hex string.
- */
-u64 GdbHexToLong(const u8* src);
-
 } // namespace GDBStub