arch-gcn3: Added missing header to hsa_driver.cc
arch-gcn3: Added missing header to hsa_driver.cc

`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 <d2406197fb1bedd1e23c70c50c510ff0e9ab0f5b@gmail.com>
Maintainer: Matt Sinclair <d2406197fb1bedd1e23c70c50c510ff0e9ab0f5b@gmail.com>
Tested-by: kokoro <2ac7b1f3fa578934c95181d4272be0d3bca00121@google.com>

gem5/gem5,gem5/gem5,gem5/gem5,gem5/gem5,gem5/gem5,gem5/gem5,gem5/gem5