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 <mattdsinclair@gmail.com>
Maintainer: Matt Sinclair <mattdsinclair@gmail.com>
Tested-by: kokoro <noreply+kokoro@google.com>
diff --git a/src/dev/hsa/hsa_driver.cc b/src/dev/hsa/hsa_driver.cc
index 3b27149..b165af4 100644
--- a/src/dev/hsa/hsa_driver.cc
+++ b/src/dev/hsa/hsa_driver.cc
@@ -43,6 +43,7 @@
 #include "params/HSADriver.hh"
 #include "sim/process.hh"
 #include "sim/proxy_ptr.hh"
+#include "sim/syscall_emul_buf.hh"
 
 HSADriver::HSADriver(HSADriverParams *p)
     : EmulatedDriver(p), device(p->device), queueId(0)