`TypedBufferArg`, used in `src/dev/hsa/hsa_driver.cc` is defined in `src/sim/syscall_emul_buf.hh` yet was not included. This commit adds this missing header. Change-Id: I3239a097eb71b6ebdad045eab6525a888a970f08 Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/33816 Reviewed-by: Matt Sinclair <mattdsinclair@gmail.com> Maintainer: Matt Sinclair <mattdsinclair@gmail.com> Tested-by: kokoro <noreply+kokoro@google.com>