gdb/amd-dbgapi: pass amd_dbgapi_inferior_info to process_event_queue

A following patch will make process_event_queue access a field of
amd_dbgapi_inferior_info.  Prepare for this by making
process_event_queue accept an amd_dbgapi_inferior_info object, instead
of a process id.

Change-Id: I9adc491dd1ff64ff74c40aa7662fffb11bd8332b
Approved-by: Lancelot Six <lancelot.six@amd.com>