misc: Use VPtr in hsa_driver.cc

misc: Use VPtr in hsa_driver.cc

This change updates HSADriver::allocateQueue to take in a ThreadContext
pointer as opposed to a PortProxy ref. This allows the TypedBufferArg
to be replaced with VPtr.

This also fixes building GCN3_X86

Change-Id: I1fea26b10c7344daf54a0cb05337e961f834a5fd
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/33655
Reviewed-by: Matt Sinclair <mattdsinclair@gmail.com>
Reviewed-by: Gabe Black <gabeblack@google.com>
Reviewed-by: Matthew Poremba <matthew.poremba@amd.com>
Maintainer: Matt Sinclair <mattdsinclair@gmail.com>
Tested-by: kokoro <noreply+kokoro@google.com>